Stock-Based Compensation Restricted stock awards (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (per share)					$ 5.73
Restricted Stock Award, Forfeitures			$ 2,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 4.42
Payments Related to Tax Withholding for Share-based Compensation				$ 376,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares			79,538	79,538
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price				$ 2.95
Shares Paid for Tax Withholding for Share Based Compensation				135,512
Share-based Compensation Arrangements by Share-based Payment Award, Options, Other Share Increase (Decrease) in Period, Weighted Average Exercise Price				$ 2.65
Unvested at December 31, 2018				0	500,000
Stock-based compensation (benefit) expense, net of forfeitures				$ (1,661,000)	$ 1,186,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 0.00
2014 Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at December 31, 2018				345,000
2018 Modified Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at December 31, 2018				247,450
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized compensation expense				$ 700,000
Weighted Average Grant Date Fair Value (per share)					$ 4.14
Forfeited				(1,495,165)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				850,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value				$ 4.14
Unvested at December 31, 2018				1,092,450	1,952,665
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 4.51
2018 Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments Related to Tax Withholding for Share-based Compensation	$ 100,000
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	32,962
Unvested at December 31, 2018				500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options				$ 600,000
Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				112,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options				$ 0
Stock-based compensation (benefit) expense, net of forfeitures		$ 400,000
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				350,000
Payments Related to Tax Withholding for Share-based Compensation	300,000
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	$ 102,550