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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss)	$ 3,567	$ (983)	$ 7,051	$ (5,541)
Dividends paid to preferred stockholders	(52)	(43)	(119)	(370)
Net income (loss) available to common stockholders	$ 3,515	$ (1,026)	$ 6,932	$ (5,911)
Denominator:
Weighted average shares outstanding – basic	36,094	25,020	33,170	20,771
Potential common shares – options / warrants (treasury stock method)	3,378		2,117
Weighted average shares outstanding – diluted	39,472	25,020	35,287	20,771
Shares excluded (anti-dilutive)	67	126	131	1,086
Net earnings (loss) per common share:
Basic	$ 0.10	$ (0.04)	$ 0.21	$ (0.28)
Diluted	$ 0.09	$ (0.04)	$ 0.20	$ (0.28)