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Stock Incentive Plans - Summary of Options Outstanding Vested and Expected to Vest (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Vested | shares 990,371
Number of Shares, Expected to vest | shares 766,938
Number of Shares, Total | shares 1,757,309
Weighted-Average Exercise Price, Vested | $ / shares $ 6.05
Weighted-average Exercise Price, Expected to vest | $ / shares 6.28
Weighted-average Exercise Price, Total | $ / shares $ 6.15
Weighted-average Remaining Contractual Life (Years), Vested 6 years 6 months 18 days
Weighted-average Remaining Contractual Life (Years), Expected to vest 8 years 8 months 12 days
Weighted-average Remaining Contractual Life (Years), Total 7 years 5 months 27 days
Aggregate Intrinsic Value, Vested | $ $ 427
Aggregate Intrinsic Value, Expected to vest | $ 0
Aggregate Intrinsic Value, Total | $ $ 427