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	Jun. 30, 2022	Dec. 31, 2021
Assets:
Marketable investments:	$ 501,927	$ 418,875
Liabilities:
Warrant liabilities	4,351	31,230
U.S. treasury securities
Assets:
Marketable investments:	237,757	161,465
U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,881	4,970
Corporate bonds
Assets:
Marketable investments:	145,882	165,190
Asset-backed securities
Assets:
Marketable investments:	31,395	46,466
Fair Value, Recurring
Assets:
Total cash equivalents	35,605	26,604
Equity investments	34,119	44,216
Total marketable investments	528,548	462,141
Liabilities:
Warrant liabilities	4,351	31,230
Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	4,351	31,230
Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	237,757	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:	74,514	39,834
Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	145,882	165,190
Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	31,395	46,466
Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	28,107	25,654
Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	7,498	950
Level 1 | Fair Value, Recurring
Assets:
Total cash equivalents	28,107	25,654
Equity investments	34,119	44,216
Total marketable investments	271,876	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:	237,757	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	28,107	25,654
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring
Assets:
Total cash equivalents	7,498	950
Equity investments	0	0
Total marketable investments	256,672	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:	74,514	39,834
Level 2 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	145,882	165,190
Level 2 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	31,395	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	7,498	950
Level 3 | Fair Value, Recurring
Assets:
Total cash equivalents	0	0
Equity investments	0	0
Total marketable investments	0	0
Liabilities:
Warrant liabilities	4,351	31,230
Level 3 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	4,351	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