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	Mar. 31, 2022	Dec. 31, 2021
Assets:
Marketable investments:	$ 581,996	$ 418,875
Liabilities:
Warrant liabilities	16,399	31,230
U.S. treasury securities
Assets:
Marketable investments:	248,989	161,465
U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,907	4,970
Corporate bonds
Assets:
Marketable investments:	157,248	165,190
Asset-backed securities
Assets:
Marketable investments:	40,874	46,466
Fair Value, Recurring
Assets:
Total cash equivalents	127,672	26,604
Equity investments	45,619	44,216
Total marketable investments	547,440	462,141
Liabilities:
Warrant liabilities	16,399	31,230
Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	16,399	31,230
Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	228,992	161,465
Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,907	4,970
Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	69,800	39,834
Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	157,248	165,190
Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	40,874	46,466
Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	47,497	25,654
Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents	19,997
Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	60,178	950
Level 1 | Fair Value, Recurring
Assets:
Total cash equivalents	67,494	25,654
Equity investments	45,619	44,216
Total marketable investments	274,611	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:	228,992	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	47,497	25,654
Level 1 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents	19,997
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring
Assets:
Total cash equivalents	60,178	950
Equity investments	0	0
Total marketable investments	272,829	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:	4,907	4,970
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:	69,800	39,834
Level 2 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	157,248	165,190
Level 2 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:	40,874	46,466
Level 2 | Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents	0
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	60,178	950
Level 3 | Fair Value, Recurring
Assets:
Total cash equivalents	0	0
Equity investments	0	0
Total marketable investments	0	0
Liabilities:
Warrant liabilities	16,399	31,230
Level 3 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	16,399	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 | U.S. treasury securities
Assets:
Total cash equivalents	0
Level 3 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	$ 0	$ 0