Stockholders Equity and Stock Options - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Stockholders Equity Note [Abstract]
Number of shares, Outstanding		2,008,902
Number of shares, Granted		402,550
Number of shares, Forfeited		(14,300)
Number of shares, Outstanding		2,397,152	2,008,902
Number of shares, Exercisable as of March 31, 2021		602,463
Number of shares, Vested and expected to vest as of March 31, 2021		2,397,152
Weighted average exercise price, balance		$ 22.31
Weighted average exercise price, Granted		18.70
Weighted average exercise price, Forfeited		(20.40)
Weighted average exercise price, balance		21.72	$ 22.31
Weighted average exercise price, Exercisable as of March 31, 2021		45.48
Weighted average exercise price, Vested and expected to vest as of March 31, 2021		$ 21.72
Weighted average remaining contractual term, outstanding		8 years	8 years 1 month 6 days
Weighted average remaining contractual term, Exercisable as of March 31, 2021		4 years
Weighted average remaining contractual term, Vested and expected to vest as of March 31, 2021		8 years
Aggregate intrinsic value, outstanding	[1]	$ 4.4
Aggregate intrinsic value, exercisable as of March 31, 2021	[1]	0.8
Aggregate intrinsic value, Vested and expected to vest as of March 31, 2021	[1]	$ 4.4

[1] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying options and the fair value of the common stock for the options that were in the money at March 31, 2021.