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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income (loss) $ 622 $ (6,880)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation 333 382
Amortization of intangible assets 1,388 1,466
Amortization of deferred financing costs 70 70
Stock-based compensation expense 1,153 1,023
Deferred income taxes and other (55) (123)
Gain on sale of product line (403) 0
Changes in operating assets and liabilities:    
Accounts receivable (923) 1,506
Inventories (292) (1,308)
Other assets (308) (466)
Accounts payable and accrued expenses (150) 2,729
Deferred revenue 741 (300)
Other liabilities (364) (85)
Net cash provided by (used in) operating activities 1,812 (1,986)
Cash flows from investing activities:    
Additions to property, plant and equipment (224) (471)
Proceeds from sale of product line 512 0
Net cash provided by (used in) investing activities 288 (471)
Cash flows from financing activities:    
Borrowing on bank line of credit 1,500 1,500
Repayment on bank line of credit (2,500) 0
Repayment of term debt (1,841) (936)
Proceeds from exercise of stock options and employee stock purchase plan 104 31
Taxes paid related to net share settlement of equity awards (156) (501)
Net cash (used in) provided by financing activities (2,893) 94
Effect of exchange rate changes on cash 74 (25)
Decrease in cash and cash equivalents (719) (2,388)
Cash and cash equivalents at beginning of period 4,508 7,821
Cash and cash equivalents at end of period 3,789 5,433
Supplemental disclosures of cash flow information:    
Cash paid for interest 1,172 383
Cash paid for income taxes, net of refunds $ (134) $ 107