Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,281,000		1,281,000
Allocated Share-based Compensation Expense	$ 860	$ 809	$ 2,452	$ 2,621
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	22,000		35,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0		401,000
Stock Repurchased and Retired During Period, Shares	0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 10.27		$ 10.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	343,000		343,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 10.89		$ 10.89
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 3.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	65,000		152,000
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			2.81%	1.96%
Allocated Share-based Compensation Expense	$ 849	785	$ 2,417	$ 2,577
Unrecognized compensation expense	$ 2,621		$ 2,621
Weighted-average period of recognition (in years)			3 years 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			36.60%	35.53%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			4 years 3 months 14 days	4 years 2 months 20 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%	0.00%
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	10,000		247,000
Unrecognized compensation expense	$ 4,192		$ 4,192
Weighted-average period of recognition (in years)			2 years 3 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	538,000		538,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	45,000		199,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 12.65		$ 11.47
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	0		19,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0		0
ESPP Plan [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 11	$ 24	$ 35	$ 44
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	17,000	0	17,000	26,000