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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities    
Net loss $ (26,889) $ (67,887)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1  
Stock-based compensation 2,642 272
Change in fair value of convertible promissory notes (includes related part amounts of $0 and $4,378, respectively)   17,073
Change in fair value of warrant liabilities - related party   37,424
Amortization of operating lease right-of-use assets 360 13
Amortization of debt discount 126  
Issuance of PIK interest debt 94  
Acquired in-process research and development - related party   2,500
Loss on disposal of property and equipment   42
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 1,895 (339)
Accounts payable, accrued expenses and other long-term liabilities (includes related party amounts of $31 and $(3,402), respectively) 4,384 (1,868)
Accrued interest (includes related party amounts of $0 and $529,respectively) 24 2,064
Operating lease liabilities 1,409 (9)
Net cash used in operating activities (15,954) (10,715)
Cash flows from investing activities    
Cash paid for purchased in-process research and development   (2,500)
Purchases of property and equipment (2,985)  
Net cash used in investing activities (2,985) (2,500)
Cash flows from financing activities    
Payment of initial public offering costs   (99)
Proceeds from exercise of stock options 80  
Net cash provided by (used in) financing activities 80 (99)
Net decrease in cash, cash equivalents and restricted cash (18,859) (13,314)
Cash, cash equivalents and restricted cash-beginning of period 281,032 124,566
Cash, cash equivalents and restricted cash-end of period 262,173 111,252
Supplemental disclosure of cash flow information    
Cash paid for interest 192  
Supplemental disclosure of noncash investing and financing activities    
Unpaid initial public offering costs   $ 548
Unpaid property and equipment purchases 3,453  
Accreted final interest payment fees $ 109