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Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 25,539 $ 15,861
Short-term marketable securities 31,829 61,768
Prepaid expenses and other current assets 4,991 2,153
Total current assets 62,359 79,782
Property and equipment, net 6,885 7,323
Right of use asset - operating lease 13,547 14,356
Restricted cash 1,097 1,097
Prepaid research and development, net of current portion 9,533 8,300
Other assets 22 7
Total assets 93,443 110,865
Current liabilities:    
Accounts payable 2,316 1,785
Accrued expenses 2,421 5,290
Deferred revenue 692 882
Lease liability - operating lease 4,294 4,152
Finance lease obligations 14 13
Total current liabilities 9,737 12,122
Long-term liabilities:    
Lease liability - operating lease, net of current portion 14,993 16,129
Finance lease obligations, net of current portion 1 4
Total long-term liabilities 14,994 16,133
Commitments and contingencies (Note 11)
Stockholders' equity    
Common stock, $0.001 par value 250,000,000 shares authorized as of March 31, 2023 and December 31, 2022. 72,238,745 shares issued and 68,041,856 shares outstanding as of March 31, 2023 and 70,933,140 shares issued and 66,736,251 shares outstanding as of December 31, 2022. 72 71
Additional paid-in capital 443,829 442,237
Accumulated other comprehensive loss (30) (161)
Accumulated deficit (372,641) (357,019)
Treasury stock, at cost (4,196,889 shares at March 31, 2023 and at December 31, 2022) (2,518) (2,518)
Total stockholders' equity 68,712 82,610
Total liabilities and stockholders' equity $ 93,443 $ 110,865