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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (3,779) $ (2,932)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 3 35
Loss on disposal of assets 18
Depreciation and amortization 40 37
Amortization of operating lease right-of-use assets 34 33
Inventory impairment loss 286
Changes in operating assets and liabilities:    
Accounts receivable and unbilled revenues, net (344) 140
Inventory 89 17
Prepaid expenses and other current assets 362 27
Accounts payable, accrued payroll and employee benefits, and accrued expenses 149 374
Contract liabilities 41 (13)
Operating lease obligations (34) (33)
Net cash used in operating activities (3,135) (2,315)
Cash flows from investing activities:    
Purchase of property and equipment (37) (36)
Proceeds from sale of property and equipment 190
Net cash (used in) provided by investing activities 153 (36)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 7,866
Principal payments on finance lease obligations (13) (52)
Net cash (used in) provided by financing activities (13) 7,814
Effect of exchange rate changes on cash and cash equivalents (53) 12
Net change in cash and cash equivalents (3,048) 5,475
Cash and cash equivalents at beginning of period 16,155 14,816
Cash and cash equivalents at end of period 13,107 20,291
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 21 60
Cash paid for interest $ 1 $ 6