Income Taxes (Summary of Income Tax Provision) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income (loss) before income taxes:
Income before taxes	$ 1,504	$ 3,816
Income tax expense (benefit)	611	1,327
Net income (loss)	$ 893	$ 2,489
Income tax provision (benefit) as a percentage of income (loss) before income taxes	40.60%	34.80%
Beginning balance adjustment to retained earnings as a result of the adoption of ASU 2016-09				$ 872
Forecast
Income (loss) before income taxes:
Income tax provision (benefit) as a percentage of income (loss) before income taxes			44.00%