Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 27,686	$ 30,819
Investments	10,849	39,676
Prepaid expenses and other current assets	3,425	7,531
Total current assets	41,960	78,026
Property and equipment, net	35,485	37,972
Operating lease right-of-use assets	35,165	36,056
Deposits and other	2,459	2,976
Total assets	115,069	155,030
Current Liabilities
Accounts payable	1,142	1,741
Accrued expenses	5,974	9,681
Operating lease liabilities, current portion	3,770	3,544
Other current liabilities	1,121	1,327
Total current liabilities	12,007	16,293
Operating lease liabilities, net of current portion	58,388	60,331
Total liabilities	70,395	76,624
Commitment and contingencies (Note 9)
Stockholders' equity
Additional paid-in capital	541,788	535,592
Accumulated other comprehensive income (loss)	2	(266)
Accumulated deficit	(497,120)	(456,924)
Total stockholders' equity	44,674	78,406
Total liabilities and stockholders' equity	115,069	155,030
Class A common stock
Stockholders' equity
Common stock	3	3
Class B common stock
Stockholders' equity
Common stock	$ 1	$ 1