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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (669) $ (4,516)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 445 484
Amortization of intangible assets 1,464 1,427
Amortization of deferred financing costs 70 98
Stock-based compensation expense 968 793
Other (53) (162)
Changes in operating assets and liabilities:    
Accounts receivable 584 5,149
Inventories (602) (1,413)
Other assets (94) (767)
Accounts payable and accrued expenses (245) 2,739
Deferred revenue (135) (256)
Other liabilities (696) (705)
Net cash provided by operating activities 1,037 2,871
Cash flows from investing activities:    
Additions to property, plant and equipment (151) (241)
Addition to intangible assets (150) 0
Net cash used in investing activities (301) (241)
Cash flows from financing activities:    
Repayments of debt (4,500) (4,829)
Debt issuance costs (101) 0
Proceeds from exercise of stock options 1,924 0
Taxes paid for issuance of stock (464) (242)
Net cash used in financing activities (3,141) (5,071)
Effect of exchange rate changes on cash (97) (12)
Decrease in cash and cash equivalents (2,502) (2,453)
Cash and cash equivalents at beginning of period 8,317 8,335
Cash and cash equivalents at end of period 5,815 5,882
Supplemental disclosures of cash flow information:    
Cash paid for interest 458 1,237
Cash paid (received) for income taxes, net of refunds $ (113) $ 110