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Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 30,901 $ 16,438
Short-term marketable securities 75,890 112,150
Prepaid expenses and other current assets 4,306 4,721
Total current assets 111,097 133,309
Long-term marketable securities   8,041
Property and equipment, net 8,464 9,088
Right of use asset - operating lease 15,034 13,889
Restricted cash 1,097 1,097
Prepaid research and development, net of current portion 7,836 9,309
Other assets 17 3
Total assets 143,545 174,736
Current liabilities:    
Accounts payable 1,502 1,944
Accrued expenses 3,249 4,402
Deferred revenue 149 531
Lease liability - operating lease 3,993 3,191
Finance lease obligations 13 12
Total current liabilities 8,906 10,080
Long-term liabilities:    
Lease liability - operating lease, net of current portion 17,278 17,372
Finance lease obligations, net of current portion 11 18
Total long-term liabilities 17,289 17,390
Commitments and contingencies (Note 11)
Stockholders' equity    
Common stock, $0.001 par value 250,000,000 shares authorized as of June 30, 2022 and December 31, 2021. 70,230,235 shares issued and outstanding as of June 30, 2022 and 69,698,844 shares issued and outstanding as of December 31, 2021. 70 70
Additional paid-in capital 440,124 438,113
Accumulated other comprehensive loss (433) (45)
Accumulated deficit (322,411) (290,872)
Total stockholders' equity 117,350 147,266
Total liabilities and stockholders' equity $ 143,545 $ 174,736