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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (1,249) $ (7,195)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 1,311 1,453
Amortization of intangible assets 4,388 4,258
Amortization of deferred financing costs 210 295
Stock-based compensation expense 3,136 2,641
Deferred income taxes and other (498) 29
Changes in operating assets and liabilities:    
Accounts receivable (727) 6,805
Inventories (4,048) (511)
Other assets (2,088) (878)
Accounts payable and accrued expenses 1,901 586
Deferred revenue (142) (380)
Other liabilities (1,049) (262)
Net cash provided by operating activities 1,145 6,841
Cash flows from investing activities:    
Additions to property, plant, and equipment (837) (1,088)
Additions to intangible assets (150) 0
Net cash used in investing activities (987) (1,088)
Cash flows from financing activities:    
Proceeds from issuance of debt 2,500 9,615
Repayments of debt (5,500) (20,251)
Debt issuance costs (102) 0
Proceeds from exercise of stock options 2,909 194
Taxes paid related to net share settlement of equity awards (2,653) (882)
Net cash used in financing activities (2,846) (11,324)
Effect of exchange rate changes on cash (81) 42
Decrease in cash and cash equivalents (2,769) (5,529)
Cash and cash equivalents at beginning of period 8,317 8,335
Cash and cash equivalents at end of period 5,548 2,806
Cash paid for interest 836 3,795
Cash paid for income taxes, net of refunds $ 506 $ 410