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Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 20,851 $ 16,438
Short-term marketable securities 99,667 112,150
Prepaid expenses and other current assets 3,900 4,721
Total current assets 124,418 133,309
Long-term marketable securities   8,041
Property and equipment, net 9,082 9,088
Right of use asset - operating lease 14,893 13,889
Restricted cash 1,097 1,097
Prepaid research and development, net of current portion 9,797 9,309
Other assets 22 3
Total assets 159,309 174,736
Current liabilities:    
Accounts payable 2,409 1,944
Accrued expenses 2,668 4,402
Deferred revenue 314 531
Lease liability - operating lease 4,261 3,191
Finance lease obligations 12 12
Total current liabilities 9,664 10,080
Long-term liabilities:    
Lease liability - operating lease, net of current portion 17,336 17,372
Finance lease obligations, net of current portion 15 18
Total long-term liabilities 17,351 17,390
Commitments and contingencies (Note 11)
Stockholders' equity    
Common stock, $0.001 par value 250,000,000 shares authorized as of March 31, 2022 and December 31, 2021. 70,267,586 shares issued and outstanding as of March 31, 2022 and 69,698,844 shares issued and outstanding as of December 31, 2021. 70 70
Additional paid-in capital 439,138 438,113
Accumulated other comprehensive loss (345) (45)
Accumulated deficit (306,569) (290,872)
Total stockholders' equity 132,294 147,266
Total liabilities and stockholders' equity $ 159,309 $ 174,736