Annual report pursuant to Section 13 and 15(d)

Income Taxes (Rate Reconciliation) (Details)

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Income Taxes (Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of expected tax provision      
Tax provision (benefit), at U.S. federal statutory tax rate $ (10,012) $ (1,559) $ (573)
State income tax, net of federal tax provision (5,390) (1,714) (1,251)
Effect of stock-based compensation excess tax benefit (11,983) (7,782) (11,522)
Effects of permanent items 1,048 2,967 1,145
Change in valuation allowance (3,364) (4,244) 2,151
Effect of change in federal income tax rate 0 0 13,792
Effect of change in state income tax rate 2,449 (269) 537
Uncertain tax positions 4,478 (2,062) 3,668
BEAT Liability 0 3,760 0
Research and development credits (6,756) (4,770) (2,815)
Change in permanent reinvestment assertion 0 0 (4,494)
State net operating loss adjustment, net of valuation allowance impact (1,588) 0 836
Other 225 2,501 117
Income tax provision (benefit) $ (30,893) $ (13,172) $ 1,591