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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (12,895) $ (6,640)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 335 353
Unrealized gain on marketable securities   (33)
Foreign currency remeasurement (gain) loss (179) 998
Gain on lease termination (501) (401)
Loss on disposal of assets, net 239  
Amortization of operating lease right-of-use asset 158 490
Provision for credit losses (4) 6
Stock-based compensation 984 682
Non-cash interest expense 53  
Gain on equity investment (166) (20)
Change in fair value of derivative liability 5,584 (279)
Change in fair value of warrant liability   (3,215)
Loss on issuance of Series G Preferred Stock   3,443
Changes in assets and liabilities:    
Decrease (increase) in inventory 117 (59)
(Increase) decrease in accounts receivable (259) 278
(Decrease) in deferred revenue (417) (106)
Decrease (increase) in other assets, current and non-current 96 (1,013)
(Decrease) in other liabilities, current and non-current (1,196) (1,287)
(Decrease) increase in accounts payable (1,066) 239
Net cash used in operating activities (9,117) (6,564)
Cash flows from investing activities    
Acquisition of property and equipment (559) (1,313)
Investment in marketable securities   (84)
Sale of marketable securities 7 4,488
Net cash provided by (used in) investing activities (552) 3,091
Cash flows from financing activities    
Payment of Series G Preferred Stock dividends (76) (95)
Payment for Repurchase of preferred stock, convertible notes and warrants (9,000)  
Proceeds from Series H Preferred Stock in private placement, net of offering costs 28,269 3,745
Net cash provided by financing activities 19,193 3,650
Effect of exchange rate changes on cash, cash equivalents and restricted cash (46) 36
Increase in cash, cash equivalents and restricted cash 9,478 213
Cash, cash equivalents, and restricted cash at beginning of the year 2,868 5,301
Cash, cash equivalents, and restricted cash at end of the period 12,346 5,514
Cash paid for    
Income taxes 51 34
Non-cash investing and financing transactions    
Capital expenditures included in accounts payable, accrued expenses and other current liabilities (125) 16
Accrual of Series G convertible preferred stock dividends 82 162
Accretion of Series G convertible preferred stock to redemption value   1,082
Initial fair value of warrant liability   5,873
Initial fair value of derivative liability   1,315
Accrued Series G convertible preferred stock redemption payable   829
Reclass of warrant liability upon warrant modification   2,658
Derecognition of right-of-use asset and operating lease liabilities upon termination of lease 47  
Lease liability remeasurement due to modification   $ 79
Noncash conversion of Series G convertible preferred stock 543  
Deemed dividend on Repurchase of Series G Preferred Stock 106  
Fair value of Placement Agent warrants 7,152  
Contribution on Repurchase of related party debt, net of warrant repurchase cost $ 4,250