Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 155,193	$ 120,027
Marketable securities	60,230
Prepaid expenses and other current assets	2,144	4,100
Total current assets	217,567	124,127
Property and equipment, net	8,595	10,100
Right-of-use assets	58,539	59,102
Restricted cash	5,031	5,037
Long-term deposit and other assets	1,647	725
Total assets	291,379	199,091
Current liabilities:
Accounts payable	3,196	2,912
Accrued expenses and other current liabilities	9,257	6,838
Operating lease liability, current portion	4,376	3,681
Deferred revenue, current portion	15,212	3,874
Current portion of long-term debt	1,110
Total current liabilities	33,151	17,305
Deferred revenue, net of current portion	7,758
Operating lease liability, net of current portion	52,662	53,013
Long-term debt and accrued interest	28,835	29,290
Other long term liabilities	12	49
Total liabilities	122,418	99,657
Commitments and contingencies (Note 6)
Stockholders' equity:
Additional paid-in capital	396,940	257,810
Accumulated deficit	(227,984)	(158,379)
Total stockholders' equity	168,961	99,434
Total liabilities and stockholders' equity	291,379	199,091
Voting Common Stock
Stockholders' equity:
Common stock	4	2
Non-voting Common Stock
Stockholders' equity:
Common stock	$ 1	$ 1