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Stockholders' Equity - Summary of Warrant Activity (Detail) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options Outstanding, Beginning balance 10,132,312  
Granted, Options Outstanding 8,024,194  
Expired / Canceled, Options Outstanding (5,495,050)  
Exercised, Options Outstanding (622,192) (500,000)
Options Outstanding, Ending balance 12,039,264 10,132,312
Weighted-Average Exercise Price, Options Beginning balance $ 4.01  
Granted, Weighted-Average Exercise Price 1.29  
Expired / Canceled, Weighted-Average Exercise Price 4.37  
Exercised, Weighted-Average Exercise Price 0.08  
Weighted-Average Exercise Price, Options Ending balance $ 2.24 $ 4.01
Warrants [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options Outstanding, Beginning balance 220,000  
Granted, Options Outstanding 0  
Expired / Canceled, Options Outstanding (75,000)  
Exercised, Options Outstanding 0  
Options Outstanding, Ending balance 145,000 220,000
Weighted-Average Exercise Price, Options Beginning balance $ 7.19  
Granted, Weighted-Average Exercise Price 0  
Expired / Canceled, Weighted-Average Exercise Price 7.36  
Exercised, Weighted-Average Exercise Price 0  
Weighted-Average Exercise Price, Options Ending balance $ 7.11 $ 7.19