Net Income (Loss) Per Common Share (Computation of Basic and Diluted Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss)	$ 3,916	$ (259)	$ 10,079	$ (250)
Denominator:
Weighted average number of shares of common stock outstanding	8,699,953	7,228,277	7,931,783	7,221,426
Weighted average effect of dilutive stock options and other stock compensation	252,796		234,976
Weighted average number of shares of common stock outstanding, as adjusted	8,952,749	7,228,277	8,166,759	7,221,426
Net income (loss) per common share:
Net income (loss) per common share - Basic	$ 0.45	$ (0.04)	$ 1.27	$ (0.03)
Net income (loss) per common share - Diluted	$ 0.44	$ (0.04)	$ 1.23	$ (0.03)