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Stock Incentive Plans - Summary of Options Outstanding Vested and Expected to Vest (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Vested | shares 927,362
Number of Shares, Expected to vest | shares 894,857
Number of Shares, Total | shares 1,822,219
Weighted-average Exercise Price, Vested | $ / shares $ 4.89
Weighted-average Exercise Price, Expected to vest | $ / shares $ 4.41
Weighted-average Remaining Contractual Life (Years), Vested 6 years 10 months 6 days
Weighted-average Remaining Contractual Life (Years), Expected to vest 8 years 2 months 19 days
Aggregate Intrinsic Value, Vested | $ $ 3,022
Aggregate Intrinsic Value, Expected to vest | $ 3,188
Aggregate Intrinsic Value, Total | $ $ 6,210