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Net Loss Per Share - Potentially Dilutive Securities Excluded from Diluted Net Loss Per Share (Detail) - shares
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from diluted net loss per share attributable to common stockholders, Total 4,464,528 6,786,451
Shares of common stock subject to outstanding options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from diluted net loss per share attributable to common stockholders, Total 2,705,393 2,561,458
Shares of common stock subject to outstanding common stock warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from diluted net loss per share attributable to common stockholders, Total 466,695 3,328,089
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from diluted net loss per share attributable to common stockholders, Total 1,292,440 896,904