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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Income tax expense	$ 0	$ 0	$ 5	$ 5
Net change in valuation allowance			7,400	$ 3,747
Valuation allowance carried against net deferred tax assets	41,000		41,000		$ 34,000
ASU 2014-09 [Member]
Income Taxes [Abstract]
Deferred revenue recognized					$ 2,500
Federal [Member]
Income Taxes [Abstract]
Net operating loss carryforwards	103,000		$ 103,000
Federal [Member] | Earliest Tax Year [Member]
Income Taxes [Abstract]
Operating loss carryforwards, expiration dates			Dec. 31, 2027
State [Member]
Income Taxes [Abstract]
Net operating loss carryforwards	$ 117,000		$ 117,000
State [Member] | Earliest Tax Year [Member]
Income Taxes [Abstract]
Operating loss carryforwards, expiration dates			Dec. 31, 2028

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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