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Stockholders' Equity - Summary of Company's Restricted Stock Unit Activity and Performance Based Restricted Stock Unit Activity (Detail)
9 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted stock units (RSUs) [Member]  
Class Of Stock [Line Items]  
Beginning balance, Unvested, Number of Shares | shares 1,178,114
Granted, Number of Shares | shares 1,959,678
Vested, Number of Shares | shares (451,587)
Canceled / forfeited, Number of Shares | shares (533,233)
Ending balance, Unvested, Number of Shares | shares 2,152,972
Beginning balance, Unvested, Weighted Average Price | $ / shares $ 3.57
Granted, Weighted Average Price | $ / shares 2.62
Vested, Weighted Average Price | $ / shares 3.27
Canceled / forfeited, Weighted Average Price | $ / shares 2.91
Ending balance, Unvested, Weighted Average Price | $ / shares $ 2.93
Performance-Based Restricted Stock Units [Member]  
Class Of Stock [Line Items]  
Beginning balance, Unvested, Number of Shares | shares 0
Granted, Number of Shares | shares 208,822
Vested, Number of Shares | shares 0
Canceled / forfeited, Number of Shares | shares 0
Ending balance, Unvested, Number of Shares | shares 208,822
Beginning balance, Unvested, Weighted Average Price | $ / shares $ 0
Granted, Weighted Average Price | $ / shares 1.88
Vested, Weighted Average Price | $ / shares 0
Canceled / forfeited, Weighted Average Price | $ / shares 0
Ending balance, Unvested, Weighted Average Price | $ / shares $ 1.88