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	Dec. 31, 2021	Dec. 31, 2020
Assets:
Marketable investments	$ 418,875	$ 410,031
Liabilities:
Warrant liabilities	31,230	343,400
U.S. treasury securities
Assets:
Marketable investments	161,465	155,347
U.S. agency and government sponsored securities
Assets:
Marketable investments	4,970	19,996
Corporate bonds
Assets:
Marketable investments	165,190	45,450
Asset-backed securities
Assets:
Marketable investments	46,466	7,018
Fair Value, Recurring
Assets:
Total cash equivalents	26,604	198,292
Marketable equity investments	44,216
Total marketable investments	462,141	276,710
Liabilities:
Warrant liabilities	31,230	343,400
Fair Value, Recurring | Public Warrants
Liabilities:
Warrant liabilities		228,933
Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	31,230	114,467
Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents		24,999
Marketable investments	161,465	130,348
Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments	4,970	19,996
Fair Value, Recurring | Commercial paper
Assets:
Marketable investments	39,834	73,898
Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments	165,190	45,450
Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments	46,466	7,018
Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	25,654	64,971
Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	950	108,322
Level 1 | Fair Value, Recurring
Assets:
Total cash equivalents	25,654	89,970
Marketable equity investments	44,216
Total marketable investments	205,681	130,348
Liabilities:
Warrant liabilities	0	228,933
Level 1 | Fair Value, Recurring | Public Warrants
Liabilities:
Warrant liabilities		228,933
Level 1 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	0	0
Level 1 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents		24,999
Marketable investments	161,465	130,348
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	25,654	64,971
Level 1 | Fair Value, Recurring | Commercial paper
Assets:
Total cash equivalents	0	0
Level 2 | Fair Value, Recurring
Assets:
Total cash equivalents	950	108,322
Marketable equity investments	0
Total marketable investments	256,460	146,362
Liabilities:
Warrant liabilities	0	114,467
Level 2 | Fair Value, Recurring | Public Warrants
Liabilities:
Warrant liabilities		0
Level 2 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	0	114,467
Level 2 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents		0
Marketable investments	0	0
Level 2 | Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments	4,970	19,996
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments	39,834	73,898
Level 2 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments	165,190	45,450
Level 2 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments	46,466	7,018
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	950	108,322
Level 3 | Fair Value, Recurring
Assets:
Total cash equivalents	0	0
Marketable equity investments	0
Total marketable investments	0	0
Liabilities:
Warrant liabilities	31,230	0
Level 3 | Fair Value, Recurring | Public Warrants
Liabilities:
Warrant liabilities		0
Level 3 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	31,230	0
Level 3 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents		0
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