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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net loss $ (6,640) $ (4,149)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 353 453
Impairment of long - lived assets   417
Impairment of operating lease right-of-use assets   254
Unrealized gain on marketable securities (33) (186)
Foreign currency remeasurement loss 998 141
Gain on lease termination (401) (655)
Loss on disposal of assets, net   (19)
Amortization of operating lease right of use asset 490 604
Provision for credit losses 6  
Stock-based compensation 682 586
Gain on equity investment (20) (1)
Change in fair value of derivative liability (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:    
Increase (decrease) in inventory (59) 30
Decrease (increase) in accounts receivable 278 (696)
(Decrease) increase in deferred revenue (106) 64
(Increase) in other assets, current and non-current (1,013) (454)
(Decrease) in other liabilities, current and non-current (1,287) (2,082)
Increase in accounts payable 239 1,549
Net cash used in operating activities (6,564) (4,125)
Impairment of other long-lived assets   652
Cash flows from investing activities    
Acquisition of property and equipment (1,313) (644)
Investment in marketable securities (84) (154)
Sale of marketable securities 4,488 1,988
Acquisition of intangibles   (9)
Net cash provided by investing activities 3,091 1,181
Cash flows from financing activities    
Stock option exercised   4
Payment of Series G Preferred Stock Dividends (95)  
Proceeds from registered offering, net of fees 3,745  
Net cash provided by financing activities 3,650 4
Effect of exchange rate changes on cash, cash equivalents and restricted cash 36 (78)
Increase (decrease) in cash, cash equivalents and restricted cash 213 (3,018)
Cash, cash equivalents, and restricted cash at beginning of the period 5,301 9,188
Cash, cash equivalents, and restricted cash at end of the period 5,514 6,170
Cash paid for    
Income taxes 34 27
Non-cash investing and financing transactions    
Capital expenditures included in Accounts payable, accrued expenses and other current liabilities 16 $ 142
Accrual of Series convertible preferred stock dividends 162  
Accrued Series G convertible preferred stock redemption payable 829  
Initial fair value of warrant liability 5,873  
Initial fair value of derivative liability 1,315  
Accretion of Series G convertible preferred stock to redemption value 1,082  
Reclass of warrant liability upon warrant modification 2,658  
Lease liability remeasurement due to modification $ 79