Net Loss Per Share - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss	$ (4,539)	$ (3,433)
Less: preferred stock dividends	0	(1)
Less: undeclared dividends	0	(366)
Induced conversion of Series A-2 Preferred Stock	0	(300)
Net loss attributable to common stockholders	$ (4,539)	$ (4,100)
Denominator:
Weighted-average number of shares of common stock - diluted (in shares)	30,816	17,756
Basic net loss per share (in dollars per share)	$ (0.15)	$ (0.23)
Diluted net loss per share (in dollars per share)	$ (0.15)	$ (0.23)