Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) shares
Number of Shares
RSUs outstanding at beginning of period (in shares)	862,850
RSUs awarded (in shares)	2,517,101
RSUs released (in shares)	(324,305)
RSUs forfeited (in shares)	(384,118)
RSUs outstanding at end of period (in shares)	2,671,528
RSUs vested and expected to vest at end of period (in shares)	2,671,528
Weighted-Average Remaining Contractual Term
RSUs outstanding at end of period (in years)	1 year 2 months 8 days
RSUs vested and expected to vest at end of period (in years)	1 year 2 months 8 days
Aggregate Intrinsic Value
RSUs outstanding at end of period | $	$ 41,689
RSUs vested and expected to vest at end of period | $	$ 41,689