Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Outstanding at beginning of period (in shares)	7,060,966
Granted (in shares)	3,823,919
Exercised (in shares)	(160,023)
Forfeitures (in shares)	(1,112,101)
Outstanding at end of period (in shares)	9,612,761	7,060,966
Weighted Average Exercise Price Per Share
Weighted average exercise price per share, outstanding at beginning of period (in dollars per share)	$ 4.55
Weighted average exercise price per share, exercised (in dollars per share)	2.90
Weighted average exercise price per share, forfeitures (in dollars per share)	4.54
Weighted average exercise price per share, outstanding at end of period (in dollars per share)	$ 4.37	$ 4.55
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding balance	$ 520	$ 2,831
Officers and Directors
Number of Shares
Granted (in shares)	1,678,425
Weighted Average Exercise Price Per Share
Weighted average exercise price per share, granted (in dollars per share)	$ 3.88
Employees
Number of Shares
Granted (in shares)	2,145,494
Weighted Average Exercise Price Per Share
Weighted average exercise price per share, granted (in dollars per share)	$ 4.12