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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income (loss)	$ (5,203)	$ 1,379	$ (8,428)	$ 3,424
Denominator:
Weighted average shares outstanding – basic	53,017	41,127	48,219	40,305
Potential common shares – options / warrants (treasury stock method)		1,952		2,041
Weighted average shares outstanding – diluted	53,017	43,079	48,219	42,346
Shares excluded (anti-dilutive)	1,871	98	1,965	98
Net earnings (loss) per common share:
Basic	$ (0.10)	$ 0.03	$ (0.17)	$ 0.08
Diluted	$ (0.10)	$ 0.03	$ (0.17)	$ 0.08