v3.24.1.1.u2
Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Cash flows from operating activities      
Net loss $ (82,852) $ (37,814)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 214 146  
Stock-based compensation 5,626 7,048  
Issuance of PIK interest debt 806 877  
Accrued interest on revenue interest financing liability 12,079 5,154  
Amortization of debt discount 474 496  
Other 1,654 763  
Changes in operating assets and liabilities:      
Prepaid expenses and other current assets 447 (5,143)  
Accounts receivable, net (2,243) 0  
Accounts payable and accrued expenses (includes changes in related party amounts of $484 and $137, respectively) (5,015) (11,303)  
Accrued interest 161 57  
Operating right-of-use assets and lease liabilities 45 50  
Inventory (416) 0  
Net cash used in operating activities (69,020) (39,669)  
Cash flows from investing activities      
Cash paid for property, plant and equipment (40) (214)  
Net cash used in investing activities (40) (214)  
Cash flows from financing activities      
Net proceeds from issuance of debt 9,900 0  
Net cash provided by financing activities 9,900 14,072  
Net decrease in cash and cash equivalents and restricted cash (59,160) (25,811)  
Cash and cash equivalents and restricted cash - beginning of period 384,256 155,890 $ 155,890
Cash and cash equivalents and restricted cash - end of period 325,096 130,079 384,256
Supplemental disclosure of cash flow information      
Interest paid 3,740 2,546  
Supplemental disclosure of noncash investing and financing activities      
Property and equipment purchases included in accounts payable and accrued expenses 7 0  
Settlement of ESPP liability in common stock 770 856  
Settlement of 401(k) liability in common stock 712 456  
At-the-Market Offering Program      
Cash flows from financing activities      
Net proceeds from issuance of common stock $ 0 $ 14,072 $ 14,100