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Stockholders' Equity - Summary of Stock Option Activity (Detail)
 9 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options Outstanding, Beginning balance | shares 10,132,312
Granted, Options Outstanding | shares 8,024,194
Cancelled / forfeited, Options Outstanding | shares (4,496,763)
Exercised, Options Outstanding | shares (622,192)
Options Outstanding, Ending balance | shares 13,037,551
Vested and Exercisable, Options Outstanding | shares 4,481,218
Weighted-Average Exercise Price, Options Beginning balance | $ / shares $ 4.01
Options granted, Weighted-Average Exercise Price | $ / shares 1.29
Options cancelled / forfeited, Weighted-Average Exercise Price | $ / shares 4.21
Options exercised, Weighted-Average Exercise Price | $ / shares 0.08
Weighted-Average Exercise Price, Options Ending balance | $ / shares 2.45
Vested and Exercisable, Weighted-Average Exercise Price | $ / shares $ 4.06
Aggregate Intrinsic Value, Options Beginning balance | $ $ 591,082
Options Exercised, Aggregate Intrinsic Value | $ 561,591
Aggregate Intrinsic Value, Options | $ 0
Vested and Exercisable, Aggregate Intrinsic Value | $ $ 0