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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (6,880) $ (669)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 382 445
Amortization of intangible assets 1,466 1,464
Amortization of deferred financing costs 70 70
Stock-based compensation expense 1,023 968
Deferred income taxes and other (123) (53)
Changes in operating assets and liabilities:    
Accounts receivable 1,506 584
Inventories (1,308) (602)
Other assets (466) (94)
Accounts payable and accrued expenses 2,729 (245)
Deferred revenue (300) (135)
Other liabilities (85) (696)
Net cash (used in) provided by operating activities (1,986) 1,037
Cash flows from investing activities:    
Additions to property, plant and equipment (471) (151)
Additions to intangible assets 0 (150)
Net cash used in investing activities (471) (301)
Cash flows from financing activities:    
Borrowing from revolving line of credit 1,500 0
Repayment of revolving line of credit 0 (4,000)
Repayment of term debt (936) (500)
Debt issuance costs 0 (101)
Proceeds from exercise of stock options 31 1,924
Taxes paid related to net share settlement of equity awards (501) (464)
Net cash provided by (used in) financing activities 94 (3,141)
Effect of exchange rate changes on cash (25) (97)
Decrease in cash and cash equivalents (2,388) (2,502)
Cash and cash equivalents at beginning of period 7,821 8,317
Cash and cash equivalents at end of period 5,433 5,815
Supplemental disclosures of cash flow information:    
Cash paid for interest 383 458
Cash paid (received) for income taxes, net of refunds $ 107 $ (113)