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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Current assets:      
Cash and cash equivalents $ 59,915   $ 65,802
Marketable securities 112,883   190,222
Prepaid expenses and other current assets 7,289   10,428
Total current assets 180,087   266,452
Property and equipment, net 8,912   10,841
Operating lease right-of-use assets 11,657   13,712
Restricted cash 1,846   1,846
Other assets 353   386
Total assets 202,855   293,237
Current liabilities:      
Accounts payable 2,283   1,691
Accrued clinical supply costs 2,141   3,669
Accrued liabilities 7,036   19,299
Deferred revenue, current portion 0   6,684
Payable to collaboration partner 3,717   17,289
Refund liability to collaboration partner, current portion 0   11,449
Operating lease liabilities, current portion 9,211   9,056
Debt, current portion 9,848   366
Total current liabilities 34,236   69,503
Deferred revenue, long-term portion 162,866   164,537
Debt, long-term portion 0   9,323
Operating lease liabilities, long-term portion 13,699   17,488
Other long-term liabilities 2,024   1,737
Total liabilities 212,825   262,588
Commitments and contingencies (Note 4)  
Stockholders' equity (deficit):      
Common stock, $0.0001 par value; 200,000,000 shares authorized; 111,656,805 and 110,362,581 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively 11   11
Additional paid-in capital 1,008,121   1,002,528
Accumulated other comprehensive income (loss) (126)   166
Accumulated deficit (1,017,976)   (972,056)
Total stockholders' equity (deficit) (9,970) $ 10,382 30,649
Total liabilities and stockholders' equity (deficit) $ 202,855   $ 293,237