Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Taxes [Abstract]
Income tax (benefit) expense	$ (1)	$ 119	$ 4	$ 126
Net change in valuation allowance	1,404	$ 2,707	5,152	$ 7,942
Valuation allowance carried against net deferred tax assets	50,000		50,000		$ 44,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	85,000		$ 85,000
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates			Dec. 31, 2027
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 69,000		$ 69,000
State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates			Dec. 31, 2016