Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Total short-term investments	$ 197,786	$ 0
U.S. treasury securities
Assets:
Total short-term investments	9,689
Corporate debt securities
Assets:
Total short-term investments	109,512
Recurring Basis
Assets:
Total cash equivalents	803,841
Total short-term investments	197,786
Total	1,001,627	1,077,550
Recurring Basis | Level 1
Assets:
Total cash equivalents	640,978
Total short-term investments	9,689
Total	650,667	1,077,550
Recurring Basis | Level 2
Assets:
Total cash equivalents	162,863
Total short-term investments	188,097
Total	350,960	0
Recurring Basis | Level 3
Assets:
Total cash equivalents	0
Total short-term investments	0
Total	0	0
Recurring Basis | U.S. treasury securities
Assets:
Total short-term investments	9,689
Recurring Basis | U.S. treasury securities | Level 1
Assets:
Total short-term investments	9,689
Recurring Basis | U.S. treasury securities | Level 2
Assets:
Total short-term investments	0
Recurring Basis | U.S. treasury securities | Level 3
Assets:
Total short-term investments	0
Recurring Basis | U.S. government agency securities
Assets:
Total short-term investments	24,502
Recurring Basis | U.S. government agency securities | Level 1
Assets:
Total short-term investments	0
Recurring Basis | U.S. government agency securities | Level 2
Assets:
Total short-term investments	24,502
Recurring Basis | U.S. government agency securities | Level 3
Assets:
Total short-term investments	0
Recurring Basis | Commercial paper
Assets:
Total short-term investments	54,083
Recurring Basis | Commercial paper | Level 1
Assets:
Total short-term investments	0
Recurring Basis | Commercial paper | Level 2
Assets:
Total short-term investments	54,083
Recurring Basis | Commercial paper | Level 3
Assets:
Total short-term investments	0
Recurring Basis | Corporate debt securities
Assets:
Total short-term investments	109,512
Recurring Basis | Corporate debt securities | Level 1
Assets:
Total short-term investments	0
Recurring Basis | Corporate debt securities | Level 2
Assets:
Total short-term investments	109,512
Recurring Basis | Corporate debt securities | Level 3
Assets:
Total short-term investments	0
Recurring Basis | Money market funds
Assets:
Total cash equivalents	640,978	1,077,550
Recurring Basis | Money market funds | Level 1
Assets:
Total cash equivalents	640,978	1,077,550
Recurring Basis | Money market funds | Level 2
Assets:
Total cash equivalents	0	0
Recurring Basis | Money market funds | Level 3
Assets:
Total cash equivalents	0	$ 0
Recurring Basis | U.S. government agency securities
Assets:
Total cash equivalents	80,317
Recurring Basis | U.S. government agency securities | Level 1
Assets:
Total cash equivalents	0
Recurring Basis | U.S. government agency securities | Level 2
Assets:
Total cash equivalents	80,317
Recurring Basis | U.S. government agency securities | Level 3
Assets:
Total cash equivalents	0
Recurring Basis | Commercial paper
Assets:
Total cash equivalents	76,704
Recurring Basis | Commercial paper | Level 1
Assets:
Total cash equivalents	0
Recurring Basis | Commercial paper | Level 2
Assets:
Total cash equivalents	76,704
Recurring Basis | Commercial paper | Level 3
Assets:
Total cash equivalents	0
Recurring Basis | Corporate debt securities
Assets:
Total cash equivalents	5,842
Recurring Basis | Corporate debt securities | Level 1
Assets:
Total cash equivalents	0
Recurring Basis | Corporate debt securities | Level 2
Assets:
Total cash equivalents	5,842
Recurring Basis | Corporate debt securities | Level 3
Assets:
Total cash equivalents	$ 0