Calculations of Basic and Diluted Loss per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Disclosure [Line Items]
Net income (loss)- basic and diluted	$ 5,948	$ 4,330	$ (11,707)	$ 903
Weighted-average shares outstanding - basic	20,357	14,572	19,123	14,422
Effect of dilutive securities:
Stock options and other stock awards	124	471		478
Weighted-average shares outstanding - basic and diluted	20,481	15,043	19,123	14,900
BASIC INCOME (LOSS) PER COMMON SHARE	$ 0.29	$ 0.30	$ (0.61)	$ 0.06
DILUTED INCOME (LOSS) PER COMMON SHARE	$ 0.29	$ 0.29	$ (0.61)	$ 0.06