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Income Taxes - Significant Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Reserves and accruals $ 918 $ 176
Prepaid expenses and other 1,086 0
Federal net operating losses 7,391 0
State net operating losses 106 0
Total gross deferred tax assets 9,501 176
Prepaid expenses and other 0 (988)
Depreciation and amortization (27,399) (12,427)
Total gross deferred tax liabilities (27,399) (13,415)
Noncurrent deferred tax liabilities, net $ (17,898) $ (13,239)