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Stock Options and Warrants - Additional Information (Detail) (USD $)
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3 Months Ended |
9 Months Ended |
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Feb. 28, 2013
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Feb. 29, 2012
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Feb. 28, 2013
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Feb. 29, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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9,615,633
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| Stock options granted, exercise price |
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$ 1.70
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| Compensation expense related to stock options and warrants |
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$ 1,128,000
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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 |
7,877,343
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7,877,343
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| Grant date fair value of warrants |
$ 0.75
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$ 0.75
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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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| Authorized shares that can be purchased for options and warrants issued |
7,600,000
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7,600,000
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| Compensation expense related to stock options and warrants |
473,000
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367,000
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2,827,000
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1,159,000
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| Grant date fair value of options and warrants vested |
378,000
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457,000
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8,773,000
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914,000
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| Unrecognized compensation costs |
1,649,000
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1,649,000
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| Weighted average period over which unrecognized compensation costs is expected to be recognized |
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1 year 4 months 21 days
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2012 Equity Incentive Plan | Warrant
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares against which warrants granted to consultants |
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750,000
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| Exercise price |
$ 0.25
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$ 0.25
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| Net cash proceeds from exercise of common stock warrants |
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$ 192,500
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2012 Equity Incentive Plan | Warrant | Consultant
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares against which warrants granted to consultants |
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515,000
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| Warrants latest vesting date |
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Apr. 30,
2013
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| Fair value of warrants |
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$ 0.56
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2012 Equity Incentive Plan | Warrant | Consultant | Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants granted, exercise price |
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$ 1.00
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| Warrants expiration dates |
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2014-09
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2012 Equity Incentive Plan | Warrant | Consultant | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants granted, exercise price |
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$ 5.00
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| Warrants expiration dates |
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2015-10
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2012 Equity Incentive Plan | Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares available for future issuance |
3,000,000
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3,000,000
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| Shares available for future stock option grants |
2,876,710
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2,876,710
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2012 Equity Incentive Plan | Stock Options | Director
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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148,290
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| Expiration date of stock option |
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5 years
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| Grant date fair value of options |
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$ 0.89
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2012 Equity Incentive Plan | Stock Options | Director | Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, exercise price |
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$ 1.40
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2012 Equity Incentive Plan | Stock Options | Director | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, exercise price |
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$ 1.55
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2012 Equity Incentive Plan | Stock Options | Employees
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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325,000
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| Expiration date of stock option |
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3 years
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| Grant date fair value of options |
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$ 0.90
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| Percentage of stock options vested immediately |
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50.00%
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| Fifty percent of remaining options vesting date |
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2013-10
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2012 Equity Incentive Plan | Stock Options | Employees | October 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of options expected to vest |
225,000
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225,000
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2012 Equity Incentive Plan | Stock Options | Employees | Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, exercise price |
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$ 1.40
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2012 Equity Incentive Plan | Stock Options | Employees | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, exercise price |
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$ 1.80
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2012 Equity Incentive Plan | Stock Options1 | Director | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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23,290
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| Number of options granted |
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2
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2012 Equity Incentive Plan | Stock Options1 | Director | Maximum | One Half of Awards
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration date of stock option |
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3 months
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2012 Equity Incentive Plan | Stock Options1 | Director | Maximum | Remaining Balance of Awards
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration date of stock option |
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6 months
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2012 Equity Incentive Plan | Stock Options 2 | Director | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options granted, shares |
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125,000
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| Expiration date of stock option |
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1 year
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2012 Equity Incentive Plan | Stock Options 2 | Employees | October 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration date of stock option |
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3 years
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| Expiration date of stock option |
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5 years
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