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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net loss	$ (5,133)	$ (5,812)	$ (17,684)	$ (21,307)
Denominator:
Weighted average shares outstanding – basic (in shares)	67,354	55,722	62,297	55,140
Potential common shares - options / warrants (treasury stock method) and convertible notes (as if converted method) (in shares)	0	0	0	0
Weighted average shares outstanding – diluted (in shares)	67,354	55,722	62,297	55,140
Shares excluded (anti-dilutive) (in shares)	7,163	4,726	8,722	2,182
Net loss per common share:
Basic (in dollars per share)	$ (0.08)	$ (0.10)	$ (0.28)	$ (0.39)
Diluted (in dollars per share)	$ (0.08)	$ (0.10)	$ (0.28)	$ (0.39)