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Stock Based Compensation - Summary of Restricted Stock Activity and Related Information (Detail) - Restricted Stock Units (RSUs)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares  
Beginning Balance | shares 541,560
Granted | shares 468,984
Vested | shares (246,675)
Forfeited | shares (19,492)
Ending Balance | shares 744,377
Weighted-Average Grant-Date Fair Value Per Share  
Beginning Balance | $ / shares $ 12.14
Granted | $ / shares 4.55
Vested | $ / shares 12.74
Forfeited | $ / shares 11.55
Ending Balance | $ / shares $ 7.17