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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net (loss) income $ (224) $ 4,747
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities    
Gain on sale of building 0 (6,894)
Gain on debt extinguishment 0 (2,443)
Stock-based compensation 435 315
Depreciation and amortization 867 742
Changes in operating assets and liabilities:    
Accounts receivable (2,342) (399)
Contract assets 368 (2,044)
Inventories (1,313) (101)
Income tax receivable 716 0
Employee retention credit receivable (1,529) 0
Other current assets (301) 220
Accounts payable 293 343
Accrued expenses 832 377
Contract liabilities 2,392 864
Net cash provided by (used in) operating activities 194 (4,273)
Cash flows from investing activities:    
Net proceeds from sale of building 0 23,076
Net proceeds from sale of equipment 10 0
Capital expenditures (665) (236)
Capitalized patent costs (53) 0
Net cash (used in) provided by investing activities (708) 22,840
Cash flows from financing activities    
Repayments of long-term debt (1,772) (9,615)
Net cash used in financing activities (1,772) (9,615)
Net (decrease) increase in cash and cash equivalents (2,286) 8,952
Cash and cash equivalents at beginning of period 16,651 7,699
Cash and cash equivalents at end of period 14,365 16,651
Supplemental disclosure of cash flow information:    
Income taxes paid 1 28
Interest paid 8 261
Non-cash investing and financing activities:    
Loan obtained for new equipment $ 432 $ 0