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Income Taxes - Income Taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes      
Effect of Tax Act $ 5,633,000 $ 0 $ 0
Valuation allowance $ 380,000 0 0
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent) 50.00%    
Amount of unrecognized tax benefits $ 2,906,000 0 $ 0
Tax benefits that would impact the effective tax rate 0    
Interest and penalties accrued related to unrecognized tax benefits 104,000,000 $ 0  
Federal income tax purpose      
Income Taxes      
Net operating loss carryforward 17,400,000    
California franchise tax purpose      
Income Taxes      
Net operating loss carryforward $ 14,700,000