Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Valuation allowance $ 21,907    
Gross unrecognized tax benefits 18,536   $ 15,628
Unrecognized tax benefits, exclusive of interest and penalties, recorded as a non-current liability 6,599   4,429
Unrecognized tax benefits that would impact effective tax rate, if recognized 12,501    
Potential interest and penalties related to unrecognized tax benefits included in income tax expense 1,306 $ 221  
Accrued interest and penalties on unrecognized tax benefits $ 7,205   $ 5,977