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Income Taxes - Difference between the Provision For (Benefit From) Income Taxes Compared to Income Taxes Computed at the Statutory Federal Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal tax provision at statutory rate	$ 6,163	$ 15,525	$ 7,479
State taxes	(601)	2,258	651
Section 162(m) limitation	2,550	2,279	738
Non-deductible expenses	325	619	686
Uncertain tax positions	(394)	(2,472)	(412)
Share-based compensation tax benefit	(6,929)	(7,892)	(4,005)
Research tax credits	(4,038)	(3,805)	(3,230)
Restructuring impact	0	7,432	(4,205)
Foreign derived intangible income deduction	(204)	(449)	(349)
Foreign rate differential	(102)	(1,424)	561
Other	385	524	(27)
Total provision for (benefit from) income taxes	$ (2,845)	$ 12,595	$ (2,113)

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