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Income Taxes - Reconciliation of Statutory U.S. Federal Income Tax Rate to Effective 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 statutory rate	$ 28,541	$ (17,442)	$ 1,451
State, net of federal benefit	(1,530)	281	59
Stock-based compensation expense	2,471	2,807	3,883
Executive compensation limitation	2,132	411	1,538
Research tax credit	(1,576)	(2,038)	248
Foreign withholding tax	9,391	10,328	33,063
Transaction costs	8,216	974	0
Foreign tax rate differential	921	1,907	474
Foreign tax credit	(2,647)	(7,795)	(33,554)
Change in valuation allowance	(47,649)	(8,238)	7,721
U.S. tax reform	(1,845)	(2,970)	(6,333)
Unrecognized tax benefits	3,049	2,994	300
Change in estimates	(1,355)	(1,300)	(10)
Foreign exchange	(7,438)		0
Others	1,432	1,057	(167)
Provision for (benefit from) income taxes	$ (7,887)	$ (19,024)	$ 8,673

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