Earnings Per Share - Details of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (8,493)	$ (5,203)	$ (15,496)	$ (8,428)
Denominator:
Weighted average shares outstanding – basic (in shares)	55,183	53,017	55,844	48,219
Potential common shares - options / warrants (treasury stock method) (in shares)	0	0	0	0
Weighted average shares outstanding – diluted (in shares)	55,183	53,017	55,844	48,219
Shares excluded (anti-dilutive) (in shares)	640	1,871	869	1,965
Net loss per common share:
Basic (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.28)	$ (0.17)
Diluted (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.28)	$ (0.17)