v3.24.4
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:        
Net loss $ (18,073) $ (37,341) $ (40,178) $ (71,525)
Adjustments to reconcile net loss to net cash provided by operating activities:        
Allowance for estimated loss on note receivable due from related party 235    
Depreciation and amortization 681 465 689 348
Employee stock-based compensation 5,130 15,675 19,710 42,346
Non-employee stock-based compensation 106 106 768
Non-cash warrant expense 984 1,020
Paycheck Protection Loan Program     (397)
Net change in operating lease assets and liabilities (908) (22) (59) (22)
Loss on operating lease cancellation 266    
Loss on write-off of inventory 896 896
(Gain) loss on the sale or disposal of property and equipment 847 (30) (18) 152
Loss on impairment of lease right-of-use assets and related improvements 1,128    
Loss on impairment of assets held for sale, net 794    
Loss on impairment of investment in Lynx 975    
Gain on fair value of convertible debt and warrant liability (49) (4,007) (8,265) 2,285
Changes in assets and liabilities:        
Prepaid expenses and other current assets 158 243 (130) (578)
Note receivable from related party     (250)
Inventory (797) (784) (98)
Other assets 523 (558) (650) 64
Accounts payable and accrued liabilities (1,702) 500 212 2,731
Other current liabilities (117) (523) 476
Other long-term liabilities (233) 300 233
Net cash used in operating activities (10,228) (23,703) (27,991) (23,450)
Cash flows from investing activities:        
Purchases of property and equipment (1,615) (1,571) (2,217) (1,787)
Capitalized patent costs (28) (12)
Note receivable from related party 15    
Payments on financing liability (77)    
Proceeds from sale of property and equipment 546 559 559 230
Net cash used in investing activities (1,082) (1,089) (1,670) (1,557)
Cash flows from financing activities:        
Proceeds from public offering, net of equity offering costs 18,595 21,209 15,302
Proceeds from ATM, net of offering costs 10,712 3,277
Proceeds from the issuance of convertible debt 7,330 7,330 9,000
Payments on convertible debt (2,353) (2,367)
Payments on financing liability (40)    
Payments on financing lease liability     (158)
Proceeds from the exercise of stock options 547 547 260
Tax withholdings related to restricted stock units and awards     (32)
Net cash provided by financing activities 10,672 24,119 29,806 24,562
Net decrease in cash (638) (673) 145 (445)
Cash, beginning of period 2,846 2,701 2,701 3,146
Cash, end of period 2,208 2,028 2,846 2,701
Supplemental disclosure of cash flow information:        
Cash paid for income taxes 1 1
Cash paid for interest 1 6 7
Supplemental disclosure of non-cash investing and financing activities:        
Debt converted to equity 16,464 18,063
Issuance of Series A Convertible Preferred stock for investment in Lynx     3,000
Operating lease right-of-use asset obtained in exchange for operating lease liability 1,861 1,263
Capital expenditures included in accounts payable and other accrued liabilities 196 204 232
Stock-based compensation expense capitalized to property and equipment $ 172 490
Incremental expense on Class C to Class A stock exchange     $ 572