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Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 33,579 $ 34,601
Marketable securities 99,201 155,009
Prepaid expenses and other current assets 1,282 926
Prepaid research and development 1,649 6,508
Total current assets 135,711 197,044
Property and equipment, net 16,067 22,515
Right of use assets - operating leases 17,045 19,723
Other assets 433 4,267
Total assets 169,256 243,549
Current liabilities:    
Accounts payable 2,749 4,065
Accrued expenses and other current liabilities 13,713 11,011
Operating lease liabilities 3,349 3,275
Total current liabilities 19,811 18,351
Operating lease liabilities - noncurrent 23,169 23,832
Total liabilities 42,980 42,183
Commitments and contingencies (note 10)
Stockholders' equity:    
Common stock, $0.0001 par value: 300,000,000 shares authorized; 54,812,972 shares issued and outstanding at September 30, 2023 and 54,614,690 shares issued and outstanding at December 31, 2022 5 5
Additional paid-in capital 704,173 694,733
Accumulated other comprehensive income (loss) (192) (966)
Accumulated deficit (577,710) (492,406)
Total stockholders' equity 126,276 201,366
Total liabilities and stockholders' equity $ 169,256 $ 243,549