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Investments in Marketable Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	$ 213,082	$ 41,092	$ 22,646
Gross unrealized gain	0	5
Gross unrealized loss	(799)	(11)
Restricted cash	5,358	5,196	$ 5,816
Available-for-sale debt securities, amortized cost	339,788	135,823
Available-for-sale debt securities fair value	338,989	135,817
U.S. treasury and agency securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost	269,393	89,342
Gross unrealized gain	0	5
Gross unrealized loss	(745)	(5)
Fair Value	268,648	89,342
Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost	27,187	2,848
Gross unrealized gain	0	0
Gross unrealized loss	(7)	0
Fair Value	27,180	2,848
Debt securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost	33,366	17,774
Gross unrealized gain	0	0
Gross unrealized loss	(47)	(6)
Fair Value	33,319	17,768
Certificates of deposit | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,000	673
Gross unrealized gain	0	0
Gross unrealized loss	0	0
Fair Value	5,000	673
Restricted cash	335
Money market funds | Level 1
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	2,357	24,036
Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	2,150	1,150
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	4,507	25,186
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	334,946	110,637
Gross unrealized gain	0	5
Gross unrealized loss	(799)	(11)
Fair Value	$ 334,147	$ 110,631

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