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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:    
Net loss $ (34,946) $ (68,920)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 857 894
Amortization of debt discount and issuance costs 147 1,357
Amortization of right-of-use asset 1,158 1,090
Change in fair value of warrant liability 0 (561)
Impairment of prepaid launch costs 0 3,685
Write-off of deferred offering costs 0 331
Loss on disposal of fixed and intangible assets 188 17
Loss on debt extinguishment 4,258 0
Stock-based compensation expense 6,493 8,480
Issuance of common stock for consulting services 0 112
Changes in operating assets and liabilities:    
Accounts receivable (879) 0
Prepaids and other current assets 6,845 (565)
Insurance receivable (308) 3,900
Other non-current assets (2,042) 2,649
Accounts payable 2,791 453
Accrued liabilities (1,728) (3,293)
Accrued interest 136 (131)
Other current liabilities (5) (14)
Contract liabilities 1,247 (1,681)
Operating lease liability (1,268) (1,153)
Litigation settlement contingency 420 (8,500)
Other non-current liabilities 25 24
Net cash used in operating activities (16,611) (61,826)
Cash flows from investing activities:    
Purchases of property, machinery and equipment 0 (94)
Proceeds from sale of property, machinery and equipment 135 113
Purchases of intangible assets (41) (38)
Net cash provided by (used in) investing activities 94 (19)
Cash flows from financing activities:    
Proceeds from issuance of convertible notes 5,300 0
Payment of convertible notes (575) 0
Proceeds from issuance of loan payable 2,000 0
Proceeds from issuance of related party notes 500 0
Principal payments on related party notes (500) 0
Principal payments on loan payable (4,719) (12,984)
Payment of debt issuance costs (438) 0
Proceeds from exercise of stock options 0 130
Proceeds from employee stock purchase plan 0 33
Proceeds from exercise of warrants 0 7,881
Repurchase of Section 16 Officer shares for tax coverage exchange (4) (88)
Payment for repurchase of common shares 0 (10,000)
Proceeds from issuance of common stock and related warrants 15,710 19,000
Payments for issuance costs related to common stock and related warrants (1,677) (2,048)
Net cash provided by financing activities 15,597 1,924
Decrease in cash, cash equivalents and restricted cash (920) (59,921)
Cash, cash equivalents and restricted cash, beginning of year 2,492 62,413
Cash, cash equivalents and restricted cash, end of year $ 1,572 $ 2,492