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Income Taxes - Reconciliation to Statutory Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Income tax expense (benefit) at U.S. statutory rates $ (1,777) $ (16,396) $ (91,105)
State taxes, net of U.S. federal impact (121) (835) (2,848)
Effect of international operations (131) 785 11,847
Research and development tax credit 726 (1,692) (2,230)
Net change in valuation allowance 388 15,098 7,747
Change in accrual for unrecognized tax benefits (6) 1,232 2,868
Share-based compensation 2,248 1,947 1,848
Effect of 2017 Tax Act     (1,690)
Asset impairment 728 495 46,872
Partial extinguishment of 2023 Notes (2,292)    
Other 164 143 (55)
Total expense (benefit) for income taxes $ (73) $ 777 $ (26,746)