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Stockholders' Equity - Warrants - Additional Information (Detail)
9 Months Ended
Dec. 31, 2018
$ / shares
Class Of Stock [Line Items]  
Weighted-average remaining contractual term of options exercisable 5 years 6 months 18 days
Minimum [Member]  
Class Of Stock [Line Items]  
Warrants exercisable price, per share $ 6.84
Maximum [Member]  
Class Of Stock [Line Items]  
Warrants exercisable price, per share $ 7.62
Warrants [Member]  
Class Of Stock [Line Items]  
Weighted-average remaining contractual term of options exercisable 9 months 10 days