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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 [Line Items]          
Income tax expense (benefit) $ 161 $ 242 $ 45 $ (2,544)  
Effective income tax rate (as a percent) 2.00% 6.00% 1.00% 126.00%  
U.S. federal statutory rate (as a percent) 21.00%   21.00%   34.00%
One-time transition tax         $ 9,000
Valuation allowance decrease $ 400   $ 400   9,000
Net tax expense or benefit         0
One-time transition tax, unrepatriated foreign earnings 400   400    
AMT credit carryforwards, one-time tax benefit         400
AMT valuation allowance decrease         400
Tax benefit arising from Tax Act         200
Unrepatriated foreign earnings, incomplete accounting for tax effect $ 0   $ 0    
State          
Income Taxes [Line Items]          
Net operating losses         67,800
Tax credit carryforwards         2,800
Federal          
Income Taxes [Line Items]          
Net operating losses         64,600
Tax credit carryforwards         6,600
Federal | Adjustment          
Income Taxes [Line Items]          
Net operating losses         (2,100)
Federal | Previously reported          
Income Taxes [Line Items]          
Net operating losses         $ 66,700