Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 49,094	$ 39,432	$ 28,625
Gross increases—current period tax positions	16,627	9,334	9,021
Gross increases—prior period tax positions	9,257	328	1,786
Unrecognized tax benefits, ending balance	$ 74,978	$ 49,094	$ 39,432