Stock Incentive Plans - Summary of Options Outstanding Vested and Expected to Vest (Detail) - 2014 Equity Incentive Plan [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Issued, Vested | shares	926,702
Number of Shares Issued, Expected to vest | shares	781,850
Number of Shares Issued, Total | shares	1,708,552
Weighted-average Exercise Price, Vested | $ / shares	$ 6.17
Weighted-average Exercise Price, Expected to vest | $ / shares	6.59
Weighted-average Exercise Price, Total | $ / shares	$ 6.37
Weighted-average Contractual Life (Years), Vested	6 years 8 months 12 days
Weighted-average Contractual Life (Years), Expected to vest	8 years 11 months 27 days
Weighted-average Contractual Life (Years), Total	7 years 9 months
Aggregate Intrinsic Value, Vested | $	$ 977
Aggregate Intrinsic Value, Expected to vest | $	35
Aggregate Intrinsic Value, Total | $	$ 1,012