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Income Taxes, Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of federal statutory income tax rate to effective income tax rate [Abstract]    
Provision at Federal statutory rate $ (322) $ (5,517)
State taxes 13 3
Permanent differences/other 581 156
Tax Cuts and Jobs Act of 2017 Rate Change 22,714 0
Stock-based compensation 365 1,157
Federal valuation allowance (used) provided (22,747) 4,508
Provision (benefit) for income taxes $ 604 $ 307