STATEMENT OF BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 51,634	$ 31,828
Marketable securities	214,555	259,405
Prepaid expenses and other current assets	3,783	3,882
Total current assets	269,972	295,115
Restricted cash	4,044	4,044
Property and equipment, net	4,122	3,929
Right-of-use asset	2,224	1,707
Other assets	309	303
Total assets	280,671	305,098
Current liabilities:
Accounts payable	7,390	7,840
Accrued expenses and other current liabilities	6,820	9,621
Operating lease liability	1,859	1,740
Total current liabilities	16,069	19,201
Other liabilities	2,400
Operating lease liability	390
Total liabilities	18,859	19,201
Commitments (Note 8)
Stockholders’ equity:
Additional paid-in capital	512,705	505,723
Accumulated other comprehensive income (loss)	(2,313)	(711)
Accumulated deficit	(248,585)	(219,120)
Total stockholders’ equity	261,812	285,897
Total liabilities and stockholders’ equity	280,671	305,098
Voting Common Stock
Stockholders’ equity:
Common stock	4	4
Non-voting Common Stock
Stockholders’ equity:
Common stock	$ 1	$ 1