Stockholder's Equity - Summary of Stock Options Activity (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Number of Shares
Number of Shares, Beginning balance | shares	1,820,160
Number of Shares, Options granted | shares	383,107
Number of Shares, Options cancelled | shares	(23,463)
Number of Shares, Options exercised | shares	(5,645)
Number of Shares, Ending balance | shares	2,174,159
Number of Shares, Outstanding and expected to vest | shares	2,121,788
Number of Shares, Exercisable | shares	1,504,713
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 10.70
Weighted Average Exercise Price, Options granted | $ / shares	11.47
Weighted Average Exercise Price, Options cancelled | $ / shares	52.69
Weighted Average Exercise Price, Options exercised | $ / shares	5.83
Weighted Average Exercise Price, Ending balance | $ / shares	10.39
Weighted Average Exercise Price, Outstanding and expected to vest | $ / shares	10.41
Weighted Average Exercise Price, Exercisable | $ / shares	$ 10.65
Weighted Average Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Life (in years)	5 years 4 months 24 days
Weighted Average Remaining Contractual Life, Outstanding and expected to vest	5 years 4 months 24 days
Weighted Average Remaining Contractual Life, Exercisable	5 years 2 months 12 days
Aggregate Intrinsic Value, Options outstanding | $	$ 6,350
Aggregate Intrinsic Value, Outstanding and expected to vest | $	6,346
Aggregate Intrinsic Value, Exercisable | $	$ 6,271