Quarterly report pursuant to Section 13 or 15(d)

Activity Related to Notes (Detail)

v3.19.1
Activity Related to Notes (Detail) - USD ($)
9 Months Ended 12 Months Ended
Jan. 31, 2018
Feb. 28, 2019
May 31, 2018
Debt Instrument [Line Items]      
Face amount of Note   $ 5,425,416 $ 0
Note repayment   (455,000) 0
Short-Term Convertible Notes      
Debt Instrument [Line Items]      
Face amount of Note $ 6,300,000 0 6,038,500
Unamortized discount   0 0
Registered direct equity offering   0 (5,788,500)
Note repayment $ (259,000) 0 (250,000)
Carrying value of Note   0 0
2019 Short Term Convertible Notes      
Debt Instrument [Line Items]      
Face amount of Note   5,460,000 0
Unamortized discount   (2,499,776) 0
Carrying value of Note   2,271,823 0
Unamortized issuance costs   $ (688,401) $ 0