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Stockholders' Equity - Summary of Company's Restricted Stock Unit Activity and Performance-Based Restricted Stock Unit Activity (Detail) - $ / shares
1 Months Ended 8 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 12, 2018
Dec. 31, 2018
Restricted stock units (RSUs) [Member]      
Class Of Stock [Line Items]      
Beginning balance, Unvested, Number of Shares   2,035,345 2,035,345
Granted, Number of Shares     1,906,402
Vested, Number of Shares     (595,163)
Canceled / forfeited, Number of Shares     (1,080,456)
Ending balance, Unvested, Number of Shares 2,266,128   2,266,128
Beginning balance, Unvested, Weighted Average Price   $ 2.89 $ 2.89
Granted, Weighted Average Price     1.18
Vested, Weighted Average Price     2.48
Canceled / forfeited, Weighted Average Price     2.35
Ending balance, Unvested, Weighted Average Price $ 1.82   $ 1.82
Performance-Based Restricted Stock Units [Member]      
Class Of Stock [Line Items]      
Beginning balance, Unvested, Number of Shares 158,706 200,470 200,470
Impact of modification, Number of Shares 0    
Granted, Number of Shares   0  
Vested, Number of Shares   (41,764)  
Canceled / forfeited, Number of Shares   0  
Ending balance, Unvested, Number of Shares 158,706 158,706 158,706
Beginning balance, Unvested, Weighted Average Price $ 1.88 $ 1.88 $ 1.88
Impact of modification, Weighted Average Price (0.74)    
Granted, Weighted Average Price   0  
Vested, Weighted Average Price   1.88  
Canceled / forfeited, Weighted Average Price   0  
Ending balance, Unvested, Weighted Average Price $ 1.04 $ 1.88 $ 1.04