Net Loss per Share - Summary of Basic and Diluted Net loss per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss	$ (21,586)	$ (21,212)	$ (21,965)	$ (20,175)	$ (19,638)	$ (18,676)	$ (64,763)	$ (58,489)
Dividends, Paid-in-kind	(287)			0			(2,546)	(8,239)
Net loss attributable to common stockholders	$ (21,873)			$ (20,175)			$ (67,309)	$ (66,728)
Denominator:
Weighted average shares of common stock outstanding—basic	83,211,000			26,609,000			50,976,000	24,667,000
Weighted average shares of common stock outstanding—diluted	83,211,000			26,609,000			50,976,000	24,667,000
Net loss per share attributable to common stockholders—basic	$ (0.26)			$ (0.76)			$ (1.32)	$ (2.71)
Net loss per share attributable to common stockholders—diluted	$ (0.26)			$ (0.76)			$ (1.32)	$ (2.71)