Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 169,394	$ 178,689
Marketable securities	48,651	111,421
Prepaid expenses and other current assets	3,085	2,612
Total current assets	221,130	292,722
Property and equipment, net	9,521	7,242
Right-of-use assets	61,097	64,357
Restricted cash	5,031	5,031
Long-term deposit and other assets	1,782	1,766
Total assets	298,561	371,118
Current liabilities:
Accounts payable	4,539	4,278
Accrued expenses and other current liabilities	12,797	15,410
Operating lease liability, current portion	6,288	4,570
Deferred revenue, current portion	7,698	11,698
Total current liabilities	31,322	35,956
Deferred revenue, net of current portion		1,246
Operating lease liability, net of current portion	58,116	60,739
Long-term debt and accrued interest	32,296	32,072
Other long term liabilities	113	135
Total liabilities	121,847	130,148
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding at June 30, 2025 and December 31, 2024	0	0
Additional paid-in capital	622,887	616,009
Accumulated other comprehensive loss	(4)	51
Accumulated deficit	(446,175)	(375,096)
Total stockholders' equity	176,714	240,970
Total liabilities and stockholders' equity	298,561	371,118
Voting Common Stock
Stockholders' equity:
Common stock	5	5
Non-voting Common Stock
Stockholders' equity:
Common stock	$ 1	$ 1