Fair Value Measurements - Schedule of Financial Assets and Liabilities Subject to Fair Value Measurements on a Recurring Basis and the Level of Inputs Used (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Marketable investments:	$ 480,393	$ 418,875
Liabilities:
Warrant liabilities	5,582	31,230
U.S. treasury securities
Assets:
Marketable investments:	207,102	161,465
U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,881	4,970
Corporate bonds
Assets:
Marketable investments:	123,845	165,190
Asset-backed securities
Assets:
Marketable investments:	20,887	46,466
Fair Value, Recurring
Assets:
Total cash equivalents	33,113	26,604
Marketable equity investments	26,585	44,216
Total marketable investments	496,983	462,141
Liabilities:
Warrant liabilities	5,582	31,230
Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	5,582	31,230
Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	207,102	161,465
Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,881	4,970
Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	113,683	39,834
Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	123,845	165,190
Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	20,887	46,466
Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	23,118	25,654
Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	9,995	950
Level 1 | Fair Value, Recurring
Assets:
Total cash equivalents	23,118	25,654
Marketable equity investments	26,585	44,216
Total marketable investments	233,687	205,681
Liabilities:
Warrant liabilities	0	0
Level 1 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	0	0
Level 1 | Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	207,102	161,465
Level 1 | Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	0	0
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	0	0
Level 1 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	0	0
Level 1 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	0	0
Level 1 | Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	23,118	25,654
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring
Assets:
Total cash equivalents	9,995	950
Marketable equity investments	0	0
Total marketable investments	263,296	256,460
Liabilities:
Warrant liabilities	0	0
Level 2 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	0	0
Level 2 | Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	0	0
Level 2 | Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,881	4,970
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	113,683	39,834
Level 2 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	123,845	165,190
Level 2 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	20,887	46,466
Level 2 | Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	9,995	950
Level 3 | Fair Value, Recurring
Assets:
Total cash equivalents	0	0
Marketable equity investments	0	0
Total marketable investments	0	0
Liabilities:
Warrant liabilities	5,582	31,230
Level 3 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	5,582	31,230
Level 3 | Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	0	0
Level 3 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	$ 0	$ 0