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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ 10,583 $ (4,866)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 0 3
Gain from patent assignment (19,389) 0
Loss on disposal of assets 2 18
Depreciation and amortization 37 49
Amortization of operating lease right-of-use assets 261 52
Inventory impairment loss 0 287
Recoveries of bad debt (138) 0
Changes in operating assets and liabilities:    
Accounts receivable and unbilled revenues, net 232 (105)
Inventory 0 132
Prepaid expenses and other current assets 9 153
Accounts payable, accrued payroll and employee benefits, and accrued expenses 84 (115)
Accrued broker fee from patent assignment 3,878 0
Contract liabilities 62 15
Operating lease obligations (258) (52)
Net cash used in operating activities (4,637) (4,429)
Cash flows from investing activities:    
Purchase of property and equipment (90) (37)
Proceeds from sale of property and equipment 0 190
Net cash provided by (used in) investing activities (90) 153
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 0 5,796
Principal payments on finance lease obligations (8) (15)
Net cash used in financing activities (8) 5,781
Net change in cash and cash equivalents (4,842) 1,444
Cash and cash equivalents at beginning of period 16,427 16,155
Cash and cash equivalents at end of period 11,585 17,599
Effect of exchange rate changes on cash and cash equivalents (107) (61)
Supplemental disclosure of cash flow information:    
Cash paid for income taxes (10) 10
Cash paid for interest 0 1
Supplemental disclosure of non-cash investing and financial activities:    
Property and equipment obtained in exchange for finance lease obligations 34 0
Receivable from patent assignment $ 19,389 $ 0