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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 $ (6,466) $ (10,123)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 3 58
Bad debt expense 172
Loss on disposal of assets 18
Depreciation and amortization 58 95
Amortization of operating lease right-of-use assets 79 65
Inventory impairment loss 357 3,572
Changes in operating assets and liabilities:    
Accounts receivable and unbilled revenue, net (51) 539
Inventory 223 (395)
Prepaid expenses and other current assets 382 (201)
Accounts payable, accrued payroll and employee benefits, and accrued expenses (213) 173
Contract liabilities (10) (26)
Operating lease obligations (144) (65)
Net cash used in operating activities (5,592) (6,308)
Cash flows from investing activities:    
Purchase of property and equipment (37) (123)
Proceeds from sale of property and equipment 189
Net cash provided by (used in) investing activities 152 (123)
Cash flow from financing activities:    
Proceeds from issuance of common stock, net of offering costs 5,796 7,866
Principal payments on finance lease obligations (17) (89)
Net cash provided by financing activities 5,779 7,777
Effect of exchange rate changes on cash and cash equivalents (67) (7)
Net increase in cash and cash equivalents 272 1,339
Cash and cash equivalents at beginning of year 16,155 14,816
Cash and cash equivalents at end of year 16,427 16,155
Supplemental disclosure of cash flow information:    
Cash paid for interest 1 9
Cash paid for income taxes 15 115
Supplemental disclosure of non-cash investing and financial activities:    
Right-of-use asset obtained in exchange for operating lease obligations $ 668