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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Number of Shares  
RSUs outstanding at beginning of period (in shares) 322,701
RSUs awarded (in shares) 834,745
RSUs released (in shares) (118,807)
RSUs forfeited (in shares) (175,789)
RSUs outstanding at end of period (in shares) 862,850
RSUs vested and expected to vest at end of period (in shares) 862,850
Weighted-Average Remaining Contractual Term  
RSUs outstanding at end of period (in years) 1 year 2 months 19 days
RSUs vested and expected to vest at end of period (in years) 1 year 2 months 19 days
Aggregate Intrinsic Value  
RSUs outstanding at end of period | $ $ 7,222
RSUs vested and expected to vest at end of period | $ $ 7,222