Net Income Loss Per Share - Effect of Anti-dilutive Securities (Detail) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of Anti-dilutive Securities	10,914,047	11,078,959
Employee Stock Option and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of Anti-dilutive Securities	10,274,878	9,781,808
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of Anti-dilutive Securities	639,169	1,297,151