Stock Options and Warrants - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
12 Months Ended |
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Apr. 08, 2019 |
Apr. 05, 2019 |
Jan. 04, 2019 |
Apr. 16, 2019 |
Mar. 29, 2019 |
Feb. 28, 2019 |
May 31, 2018 |
Feb. 28, 2018 |
Feb. 28, 2019 |
Feb. 28, 2018 |
May 31, 2018 |
Mar. 20, 2019 |
Feb. 13, 2019 |
Feb. 01, 2019 |
Jul. 10, 2018 |
Jun. 15, 2018 |
Aug. 24, 2017 |
Mar. 31, 2016 |
Feb. 28, 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Vesting period |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 1.00
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$ 1.00
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Common Stock issued |
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304,679,081
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216,881,790
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304,679,081
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216,881,790
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Compensation expense |
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$ 2,891,548
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$ 1,096,226
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |
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1,145,834
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Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms |
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150,000
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Subsequent event |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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150,000
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Warrants to purchase common shares, shares |
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785,700
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3,895,200
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Exercise price of warrants, per share |
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$ 0.50
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$ 0.50
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Common Stock issued |
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8,730,000
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Managing Director |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |
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100,000
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Placement Agent |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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965,563
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133,600
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Term of warrants |
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5 years
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Exercise price of warrants, per share |
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$ 0.50
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$ 0.50
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$ 0.50
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$ 0.55
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Consultant |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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300,000
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300,000
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Term of warrants |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 0.56
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Warrants grant date fair value |
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$ 0.30
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$ 0.30
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Consultant | compensable warrant |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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500,000
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500,000
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Term of warrants |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 0.51
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$ 0.51
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Warrants grant date fair value |
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$ 0.28
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$ 0.28
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Investor |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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5,000,000
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5,000,000
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Term of warrants |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 0.30
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$ 0.50
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$ 0.30
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$ 0.50
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Common Stock issued |
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3,295,000
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3,295,000
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Proceeds from Issuance of Common Stock |
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$ 1,600,000
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Private Equity Offering |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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23,487,585
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23,487,585
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Term of warrants |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 0.75
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$ 0.75
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Proceeds from Issuance of Common Stock |
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$ 23,500,000
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Private Equity Offering | Subsequent event |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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1,000,000
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Private Equity Offering | Placement Agent |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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4,446,917
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4,446,917
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Term of warrants |
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5 years
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5 years
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Exercise price of warrants, per share |
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$ 0.50
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$ 0.50
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Subscription Agreements |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants to purchase common shares, shares |
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1,970,000
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Term of warrants |
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5 years
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Exercise price of warrants, per share |
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$ 0.75
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Convertible notes payable offering |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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5,460,000
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Stock option granted, exerices price |
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$ 0.30
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Stock options grant date fair value |
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$ 0.50
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Term of warrants |
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5 years
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5 years
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Share Based Compensation Arrangement by Sharebased Payment Award Options Vested |
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$ 972,000
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$ 972,000
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Direct equity offering |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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5,364,240
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Stock option granted, exerices price |
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$ 0.50
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Term of warrants |
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5 years
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5 years
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Direct equity offering | Placement Agent |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock options grant date fair value |
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$ 0.50
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Share Based Compensation Arrangement by Sharebased Payment Award Options Vested |
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$ 965,563
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$ 965,563
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Employee Stock Option One | Managing Director |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, exerices price |
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$ 0.50
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Stock options grant date fair value |
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$ 0.27
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2012 Equity Incentive Plan |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Compensation expense |
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1,400,000
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$ 600,000
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$ 2,900,000
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1,100,000
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Grant date fair value of options and warrants |
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700,000
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$ 1,800,000
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800,000
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$ 1,300,000
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Unrecognized compensation expense |
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$ 4,900,000
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$ 4,900,000
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Weighted average period over which unrecognized compensation expense is expected to be recognized |
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2 years 6 months 29 days
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2012 Equity Incentive Plan | Executive Management and Employees |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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800,000
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2012 Equity Incentive Plan | Employee Stock Option One | Managing Director |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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38,904
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Stock option granted, exerices price |
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$ 0.47
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Vesting period |
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1 year
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2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Tranche One |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option vested, Shares |
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13,904
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2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Tranche Two |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option vested, Shares |
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25,000
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2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Range One |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock option granted, Shares |
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680,822
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Stock option granted, exerices price |
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$ 0.49
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2012 Equity Incentive Plan | Employee Stock Option One | Managing Director | Range Two |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
80,822
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Employee Stock Option One | Executive Chairman |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
80,822
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.30
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.31
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member] | Minimum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Annual increase stock option granted, shares |
|
|
|
|
|
|
|
|
75,000
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Employee Stock Option One | Non Employee Directors [Member] | Maximum |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Annual increase stock option granted, shares |
|
|
|
|
|
|
|
|
100,000
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares available for future stock-based grants |
|
|
|
|
|
164,144
|
|
|
164,144
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Before Amendment |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares available for future issuance |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
7,000,000
|
5,000,000
|
3,000,000
|
2012 Equity Incentive Plan | Stock Options | After Amendment |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares available for future issuance |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
15,000,000
|
7,000,000
|
5,000,000
|
2012 Equity Incentive Plan | Stock Options | Managing Director |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
500,000
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.565
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.30
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Executive Management and Employees |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
875,000
|
|
|
|
|
|
|
|
|
|
|
Vesting period |
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options granted, exercise price, lower range limit |
|
|
|
|
|
|
|
|
$ 0.49
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.31
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Executive Chairman |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
950,000
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.49
|
|
|
|
|
|
|
|
|
|
|
Vesting period |
|
|
|
|
|
|
|
|
24 months
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.41
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
1,000,000
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.565
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.30
|
|
|
|
|
|
|
|
|
|
|
Stock option award vesting percentage |
|
|
|
|
|
|
|
|
50.00%
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Officer | Subsequent event |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option award vesting percentage |
50.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Chief medical officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
350,000
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.551
|
|
|
|
|
|
|
|
|
|
|
Vesting period |
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.30
|
|
|
|
|
|
|
|
|
|
|
2012 Equity Incentive Plan | Stock Options | Chief technology officer |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, Shares |
|
|
|
|
|
|
|
|
400,000
|
|
|
|
|
|
|
|
|
|
|
Stock option granted, exerices price |
|
|
|
|
|
|
|
|
$ 0.48
|
|
|
|
|
|
|
|
|
|
|
Vesting period |
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
|
|
|
|
|
Stock options, term |
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
|
|
|
|
|
Stock options grant date fair value |
|
|
|
|
|
|
|
|
$ 0.26
|
|
|
|
|
|
|
|
|
|
|