Stockholder's Equity - Summary of Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020
Number of Shares
Number of Shares, Beginning balance	1,820,160
Number of Shares, Options granted	524,583
Number of Shares, Options cancelled	(245,179)
Number of Shares, Options exercised	(19,489)
Number of Shares, Ending balance	2,080,075
Number of Shares, Outstanding and expected to vest	2,001,581
Number of Shares, Exercisable	1,606,343
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance	$ 10.70
Weighted Average Exercise Price, Options granted	10.89
Weighted Average Exercise Price, Options cancelled	18.66
Weighted Average Exercise Price, Options exercised	4.51
Weighted Average Exercise Price, Ending balance	9.87
Weighted Average Exercise Price, Outstanding and expected to vest	9.90
Weighted Average Exercise Price, Exercisable	$ 10.26
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life (in years)	5 years 7 months 6 days
Weighted Average Remaining Contractual Life, Outstanding and expected to vest	5 years 6 months
Weighted Average Remaining Contractual Life, Exercisable	4 years 7 months 6 days
Aggregate Intrinsic Value, Options outstanding	$ 15,846
Aggregate Intrinsic Value, Outstanding and expected to vest	15,609
Aggregate Intrinsic Value, Exercisable	$ 14,242