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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Current Assets:    
Cash and cash equivalents $ 148,210 $ 82,021
Short-term investments 48,947 0
Prepaid expenses and other current assets 3,191 2,698
Total current assets 200,348 84,719
Property and equipment, net 17,174 20,115
Operating lease right-of-use assets 3,681 4,344
Finance lease right-of-use assets 98 87
Restricted cash 508 0
Other non-current assets 764 0
Total assets 222,573 109,265
Current liabilities:    
Accounts payable 2,596 625
Accrued expenses and other current liabilities 17,495 5,324
Operating lease liabilities, current 2,559 678
Finance lease liabilities, current 42 24
Lease contingent value rights liability, current 281 0
Total current liabilities 22,973 6,651
Operating lease liabilities, non-current 12,302 3,921
Finance lease liabilities, non-current 65 66
Lease contingent value rights liability, non-current 1,006 0
Other liabilities 203 0
Total liabilities 36,549 10,638
Commitments and contingencies (Note 10)
Convertible preferred stock:    
Total convertible preferred stock 0 244,366
Stockholders' equity (deficit)    
Preferred stock, $0.000001 par value; 50,000,000 and 0 shares authorized as of December 31, 2023 and 2022, respectively; 0 shares issued and outstanding as of December 31, 2023 and 2022, respectively 0 0
Common stock, value, issued 0 0
Additional paid-in capital 373,178 5,098
Accumulated deficit (187,154) (150,837)
Total stockholders' equity (deficit) 186,024 (145,739)
Total liabilities, convertible preferred stock and stockholders' equity (deficit) 222,573 109,265
Series A-1 Convertible Preferred Stock    
Convertible preferred stock:    
Total convertible preferred stock 0 34,414
Series A-2 Convertible Preferred Stock    
Convertible preferred stock:    
Total convertible preferred stock 0 28,675
Series B Convertible Preferred Stock    
Convertible preferred stock:    
Total convertible preferred stock 0 181,277
Class A Common Stock    
Stockholders' equity (deficit)    
Common stock, value, issued 0 0
Class B Common Stock    
Stockholders' equity (deficit)    
Common stock, value, issued $ 0 $ 0