Stock Based Awards - Summary of Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of shares
Number of Shares, Beginning balance	1,820,160	1,515,923
Number of Shares, Options granted	799,460	483,328
Number of Shares, Options exercised	(114,515)	(39,686)
Number of Shares, Options cancelled	(331,329)	(139,405)
Number of Shares, Ending balance	2,173,776	1,820,160
Number of Shares, Vested and expected to vest	2,074,651
Number of Shares, Exercisable	1,593,995
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 10.70	$ 18.65
Weighted Average Exercise Price, Options granted	9.19	5.55
Weighted Average Exercise Price, Options exercised	2.76	2.40
Weighted Average Exercise Price, Options cancelled	17.07	81.33
Weighted Average Exercise Price, Ending balance	9.59	$ 10.70
Weighted Average Exercise Price, Vested and expected to vest	9.68
Weighted Average Exercise Price, Exercisable	$ 10.32
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life (in years)	5 years 9 months 18 days
Weighted Average Remaining Contractual Life, Vested and expected to vest	5 years 7 months 6 days
Weighted Average Remaining Contractual Life, Exercisable	4 years 7 months 6 days
Aggregate Intrinsic Value, Options outstanding	$ 5,905
Aggregate Intrinsic Value, Vested and expected to vest	5,891
Aggregate Intrinsic Value, Exercisable	$ 5,816