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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash Flows from Operating Activities    
Net income (loss) $ 3,345 $ (1,758)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation expense 599 698
Restructuring 0 304
Stock-based compensation 288 222
Net pension (payment) cost (296) (210)
Changes in assets and liabilities:    
Increase in accounts receivable and contract assets (7,202) (3,585)
Decrease (increase) in prepaid expenses, income tax receivable and other current assets 106 (1,220)
Increase (decrease) in accounts payable and accrued expenses 3,935 (164)
(Decrease) increase in other accrued expenses and liabilities (1,539) 38
Net cash used in operating activities (764) (5,675)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (1,429) (735)
Proceeds from sale of property, plant and equipment 57 0
Net cash used in investing activities (1,372) (735)
Cash Flows from Financing Activities    
Debt financing costs (93) (113)
Payment of finance leases (55) (56)
Treasury stock activities (134) (30)
Net cash used in financing activities (282) (199)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (504) (458)
Net decrease in cash and cash equivalents and restricted cash (2,922) (7,067)
Cash and cash equivalents and restricted cash at beginning of period 15,133 33,562
Cash and cash equivalents and restricted cash at end of period 12,211 26,495
Supplemental disclosures    
Cash paid for interest 97 99
Cash (received) paid for income taxes, net (172) 27
Non-cash investing and financing activities    
Purchases of property, plant and equipment included in accounts payable $ 3,005 $ 1,919