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Income Taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 88,433	$ 66,435	$ 44,321
Additions	35,370	21,998	22,114
Deductions	0	0	0
Balance at end of year	$ 123,803	$ 88,433	$ 66,435