Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 95,608	$ 120,027
Prepaid expenses and other current assets	5,299	4,100
Total current assets	100,907	124,127
Property and equipment, net	9,019	10,100
Right-of-use assets	57,914	59,102
Restricted cash	5,031	5,037
Long-term deposit and other assets	706	725
Total assets	173,577	199,091
Current liabilities:
Accounts payable	2,773	2,912
Accrued expenses and other current liabilities	7,438	6,838
Operating lease liability, current portion	3,836	3,681
Deferred revenue, current portion		3,874
Total current liabilities	14,047	17,305
Operating lease liability, net of current portion	51,972	53,013
Long-term debt and accrued interest	29,504	29,290
Other long term liabilities	36	49
Total liabilities	95,559	99,657
Commitments and contingencies (Note 6)
Stockholders' equity:
Additional paid-in capital	258,957	257,810
Accumulated deficit	(180,942)	(158,379)
Total stockholders' equity	78,018	99,434
Total liabilities and stockholders' equity	173,577	199,091
Voting Common Stock
Stockholders' equity:
Common stock	2	2
Non-voting Common Stock
Stockholders' equity:
Common stock	$ 1	$ 1