CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 133,860	$ 84,319
Marketable securities	123,876	266,990
Accounts receivable, net of allowance of $0 and $0, respectively	368	0
Inventory, net	3,945	0
Prepaid expenses and other current assets	4,261	6,873
Total current assets	266,310	358,182
Property and equipment, net	16,275	16,849
Internally developed software	532	0
Operating lease right-of-use assets	14,438	15,757
Other assets	695	697
Total assets	298,250	391,485
Current liabilities:
Accounts payable	1,766	3,903
Accrued payroll and payroll-related costs	4,943	5,548
Accrued contracted services	1,519	3,616
Accrued expenses and other current liabilities	1,815	1,270
Current portion of operating lease liabilities	1,566	1,369
Total current liabilities	11,609	15,706
Warrant liabilities	1,274	996
Operating lease liabilities	13,737	16,077
Other long-term liabilities	11	0
Total liabilities	26,631	32,779
Commitments and contingencies (Note 18)
Stockholders' equity
Additional paid-in capital	767,239	758,366
Accumulated deficit	(495,634)	(399,674)
Total stockholders' equity	271,619	358,706
Total liabilities and stockholders' equity	298,250	391,485
Class A Common Stock [Member]
Stockholders' equity
Common Stock	12	12
Class B Common Stock [Member]
Stockholders' equity
Common Stock	$ 2	$ 2