Earnings Per Share - Details of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss	$ (5,812)	$ (18,607)	$ (21,307)	$ (27,035)
Denominator:
Weighted average shares outstanding – basic (in shares)	55,722	53,939	55,140	50,147
Potential common shares - options / warrants (treasury stock method) and convertible notes (in shares)	0	0	0	0
Weighted average shares outstanding – diluted (in shares)	55,722	53,939	55,140	50,147
Shares excluded (anti-dilutive) (in shares)	8,097	1,279	2,182	1,333
Net loss per common share:
Basic (in dollars per share)	$ (0.10)	$ (0.34)	$ (0.39)	$ (0.54)
Diluted (in dollars per share)	$ (0.10)	$ (0.34)	$ (0.39)	$ (0.54)