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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
RSUs outstanding at December 31, 2017, Number of Shares 80,172
RSUs awarded, Number of Shares 346,055
RSUs released, Number of Shares (55,592)
RSUs forfeited, Number of Shares (47,934)
RSUs outstanding at December 31, 2018, Number of Shares 322,701
RSUs vested and expected to vest at December 31, 2018, Number of Shares 322,701
RSUs outstanding at December, 31, 2018, Weighted Average Remaining Contractual Term 1 year 3 months
RSUs vested and expected to vest at December 31, 2018, Weighted Average Remaining Contractual Term 1 year 3 months
RSUs outstanding at December 31, 2018, Aggregate Intrinsic Value | $ $ 3,705
RSUs vested and expected to vest at December 31, 2018, Aggregate Intrinsic Value | $ $ 3,705