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Condensed Balance Sheets (unaudited) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 27,201 $ 29,878
Marketable securities 43,587 52,826
Accounts receivable 120 113
Other receivables 0 6,000
Prepaid expenses and other current assets 1,202 1,308
Total current assets 72,110 90,125
Property and equipment, net 2,907 3,059
Long-term marketable securities 28,917 21,329
Other assets 1,676 1,816
Total assets 105,610 116,329
Current liabilities:    
Accounts payable 1,590 1,548
Accrued and other current liabilities 2,692 4,444
Finance lease obligation, current portion 451 464
Deferred revenue 9,067 9,082
Total current liabilities 13,800 15,538
Finance lease obligation, net of current portion 519 626
Long-term portion 1,081 1,222
Total liabilities 15,400 17,386
Commitments and Contingencies
Stockholders' equity:    
Common stock, $0.0001 par value; 150,000,000 Class A shares authorized; 29,616,781 and 29,612,687 Class A shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively; 1,500,000 Class B shares authorized; 1,405,259 Class B shares issued and outstanding as of March 31, 2023 and December 31, 2022. 3 3
Additional paid-in capital 311,883 310,575
Accumulated other comprehensive loss (457) (981)
Accumulated deficit (221,219) (210,654)
Total stockholders' equity 90,210 98,943
Total liabilities and stockholders' equity $ 105,610 $ 116,329