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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