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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (1,079) $ (6,097)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 891 982
Amortization of intangible assets 2,929 2,881
Amortization of deferred financing costs 140 197
Stock-based compensation expense 2,132 1,562
Deferred income taxes and other (303) 423
Changes in operating assets and liabilities:    
Accounts receivable 323 5,855
Inventories (2,526) (1,374)
Other assets (1,517) (601)
Accounts payable and accrued expenses 1,629 1,925
Deferred revenue (100) (276)
Other liabilities (714) (233)
Net cash provided by operating activities 1,805 5,244
Cash flows from investing activities:    
Additions to property, plant and equipment (357) (524)
Additions to intangible assets (150) 0
Net cash used in investing activities (507) (524)
Cash flows from financing activities:    
Proceeds from issuance of debt 0 6,115
Repayments of debt (5,000) (16,411)
Debt issuance costs (102) 0
Proceeds from exercise of stock options 2,759 187
Taxes paid related to net share settlement of equity awards (990) (262)
Net cash used in financing activities (3,333) (10,371)
Effect of exchange rate changes on cash (45) (55)
Decrease in cash and cash equivalents (2,080) (5,706)
Cash and cash equivalents at beginning of period 8,317 8,335
Cash and cash equivalents at end of period 6,237 2,629
Cash paid for interest 834 2,549
Cash paid for income taxes, net of refunds $ 168 $ 98