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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income (loss)	$ 4,038	$ 1,228	$ 6,163	$ 9
Net income (loss), as adjusted	$ 4,038	$ 1,228	$ 6,163	$ 9
Denominator:
Weighted average number of shares of common stock outstanding	7,817,628	7,219,423	7,541,332	7,217,943
Weighted average effect of dilutive stock options and other stock compensation	258,480	140,714	243,071	115,163
Weighted average number of shares of common stock outstanding, as adjusted	8,076,108	7,360,137	7,784,403	7,333,106
Net income per common share:
Net income (loss) per common share - Basic	$ 0.52	$ 0.17	$ 0.82	$ 0.00
Net income (loss) per common share - Diluted	$ 0.50	$ 0.17	$ 0.79	$ 0.00