Net Income (Loss) per Common Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic and Diluted		16,469	17,025	16,393
Weighted Average Number of Shares Outstanding, Basic	17,188	16,469	17,025	16,393
Schedule of reconciliation of basic and diluted weighted average common shares outstanding
Dilutive common shares issuable in connection with stock plans	0	0	0	0
Weighted average common shares outstanding - diluted	17,188	16,469	17,025	16,393