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Income Taxes Deferred Tax Assets and Liabilities (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Components of Deferred Tax Assets [Abstract]  
Accrued expenses $ 4,276
Net operating loss (NOL) carryforward 667
Other 106
Gross deferred tax assets 5,049
Valuation allowance (3,277)
Total deferred tax asset 1,772
Components of Deferred Tax Liabilities [Abstract]  
Depreciation and amortization (1,638)
Prepaid expenses (134)
Total deferred tax liabilities (1,772)
Net deferred tax asset $ 0