Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Tax Expense (Benefit) (Details)

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Income Taxes Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ (6,821) $ (6,814) $ (11,899)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 11 20 17
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount (7,815) (8,849) (8,153)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (4,489) 8,640 23,666
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount (2,750) 74 (5,713)
Income Tax Reconciliation Foreign Dividends 3,936 1,103 0
Income tax impact to provision due to transaction costs 0 0 553
Tax Adjustments, Settlements, and Unusual Provisions 1,887 (27) (917)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount 1,244 1,463 1,993
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 0 0 (5)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 716 1,319 1,730
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount (103) 1,960 (1,368)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 0 185 25,205
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount 0 0 1,257
Attribute expirations (2,837) 0 0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (1,239) (5,727) (51,177)
Provision (benefit) for income taxes $ (12,586) $ (6,653) $ (24,811)