CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 53,163	$ 133,860
Marketable securities	182,268	123,876
Accounts receivable, net of allowance of $0 and $0, respectively	242	368
Inventory, net	4,946	3,945
Prepaid expenses and other current assets	3,756	4,261
Total current assets	244,375	266,310
Property and equipment, net	16,169	16,275
Internally developed software	496	532
Operating lease right-of-use assets	13,850	14,438
Other assets	695	695
Total assets	275,585	298,250
Current liabilities:
Accounts payable	1,164	1,766
Accrued payroll and payroll-related costs	2,103	4,943
Accrued contracted services	1,212	1,519
Accrued expenses and other current liabilities	1,883	1,815
Current portion of operating lease liabilities	1,610	1,566
Total current liabilities	7,972	11,609
Warrant liabilities	955	1,274
Operating lease liabilities	12,873	13,737
Other long-term liabilities	14	11
Total liabilities	21,814	26,631
Commitments and contingencies (Note 15)
Stockholders' equity
Additional paid-in capital	768,898	767,239
Accumulated other comprehensive loss	(33)	0
Accumulated deficit	(515,108)	(495,634)
Total stockholders' equity	253,771	271,619
Total liabilities and stockholders' equity	275,585	298,250
Class A Common Stock [Member]
Stockholders' equity
Common Stock	12	12
Class B Common Stock [Member]
Stockholders' equity
Common Stock	$ 2	$ 2