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, 2023	Dec. 31, 2022
Assets:
Marketable investments:	$ 243,003	$ 389,671
Liabilities:
Warrant liabilities	1,660	3,005
U.S. treasury securities
Assets:
Marketable investments:	205,792	188,480
U.S. agency and government sponsored securities
Assets:
Marketable investments:	5,691	4,924
Corporate bonds
Assets:
Marketable investments:	31,520	109,909
Asset-backed securities
Assets:
Marketable investments:		11,835
Fair Value, Recurring
Assets:
Total cash equivalents	33,932	42,056
Marketable equity investments	8,255	29,643
Total marketable investments	246,242	419,314
Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	1,660	3,005
Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	201,771	188,480
Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Marketable investments:	4,696	4,924
Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:		74,523
Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	31,520	109,909
Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:		11,835
Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	28,916	42,056
Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents	4,021
Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Total cash equivalents	995
Level 1 | Fair Value, Recurring
Assets:
Total cash equivalents	32,937	42,056
Marketable equity investments	8,255	29,643
Total marketable investments	210,026	218,123
Level 1 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	0	0
Level 1 | Fair Value, Recurring | U.S. treasury securities
Assets:
Marketable investments:	201,771	188,480
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
Level 1 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	0	0
Level 1 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:		0
Level 1 | Fair Value, Recurring | Money market funds
Assets:
Total cash equivalents	28,916	42,056
Level 1 | Fair Value, Recurring | U.S. treasury securities
Assets:
Total cash equivalents	4,021
Level 1 | Fair Value, Recurring | U.S. agency and government sponsored securities
Assets:
Total cash equivalents	0
Level 2 | Fair Value, Recurring
Assets:
Total cash equivalents	995	0
Marketable equity investments	0	0
Total marketable investments	36,216	201,191
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:	4,696	4,924
Level 2 | Fair Value, Recurring | Commercial paper
Assets:
Marketable investments:		74,523
Level 2 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	31,520	109,909
Level 2 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:		11,835
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 | U.S. agency and government sponsored securities
Assets:
Total cash equivalents	995
Level 3 | Fair Value, Recurring
Assets:
Total cash equivalents	0	0
Marketable equity investments	0	0
Total marketable investments	0	0
Level 3 | Fair Value, Recurring | Private Warrants
Liabilities:
Warrant liabilities	1,660	3,005
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
Level 3 | Fair Value, Recurring | Corporate bonds
Assets:
Marketable investments:	0	0
Level 3 | Fair Value, Recurring | Asset-backed securities
Assets:
Marketable investments:		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 | U.S. agency and government sponsored securities
Assets:
Total cash equivalents	$ 0