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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net (loss) income	$ (18,607)	$ 161	$ (27,035)	$ 3,585
Denominator:
Weighted average shares outstanding – basic	53,939	41,351	50,147	40,656
Potential common shares – options / warrants (treasury stock method)		1,675		1,921
Weighted average shares outstanding – diluted	53,939	43,026	50,147	42,577
Shares excluded (anti-dilutive)	1,279	101	1,333	101
Net (loss) earnings per common share:
Basic	$ (0.34)	$ 0.00	$ (0.54)	$ 0.09
Diluted	$ (0.34)	$ 0.00	$ (0.54)	$ 0.08