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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (15,329) $ (39,660)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 443 452
Amortization of debt discount and issuance costs 46 890
Amortization of right-of-use asset 570 537
Change in fair value of warrant liability 0 (338)
Loss on disposal of fixed and intangible assets 55 17
Stock-based compensation expense 3,178 4,297
Issuance of common stock for consulting services 0 112
Changes in operating assets and liabilities:    
Accounts receivable (15) (434)
Prepaids and other current assets 3,674 3,401
Insurance receivable (308) 0
Other non-current assets 31 (337)
Accounts payable 805 258
Accrued liabilities 451 (1,298)
Accrued interest 0 79
Other current liabilities (4) 1
Contract liabilities 115 (648)
Operating lease liability (625) (569)
Litigation settlement contingency 526 0
Other non-current liabilities 13 12
Net cash used in operating activities (6,374) (33,228)
Cash flows from investing activities:    
Purchases of property, machinery and equipment 0 (53)
Proceeds from sale of property, machinery and equipment 0 63
Purchases of intangible assets (40) (25)
Net cash used in investing activities (40) (15)
Cash flows from financing activities:    
Proceeds from issuance of loan payable 350 0
Proceeds from exercise of stock options 0 130
Proceeds from employee stock purchase plan 0 31
Repurchase of Section 16 Officer shares for tax coverage exchange (3) (60)
Principal payments on loan payable (2,319) (6,298)
Payment of deferred offering costs 0 (121)
Payment for repurchase of common shares 0 (10,000)
Proceeds from issuance of common stock and related warrants 8,000 10,000
Payments for issuance costs related to common stock and related warrants (829) (700)
Net cash provided by (used in) financing activities 5,199 (7,018)
Decrease in cash, cash equivalents and restricted cash (1,215) (40,261)
Cash, cash equivalents and restricted cash, beginning of period 2,492 62,413
Cash, cash equivalents and restricted cash, end of period 1,277 22,152
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property, machinery and equipment in accounts payable and accrued expenses at period end 0 41
Purchases of intangible assets in accounts payable and accrued expenses at period end 18 0
Deferred offering costs in accounts payable and accrued expenses at period end 0 16
Supplemental disclosure of cash flow information    
Cash paid for interest $ 12 $ 684