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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income (loss) $ 745 $ (1,738) [1]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 254 335
Operating lease asset amortization 832 898
Impairment of long-lived assets 0 1,069
Loss on disposal of assets 0 6
Stock-based compensation 183 228
Deferred income taxes 19 (264)
Exchange gain 0 (3)
Changes in operating assets and liabilities:    
Accounts receivable-trade (65) 88
Inventory (2,101) (5,302)
Prepaid expenses (321) 27
Other current assets 7 46
Accounts payable-trade 2,041 3,107
Accrued expenses and other liabilities 316 (385)
Income taxes, net 1,198 (293)
Other assets 0 (952)
Operating lease liabilities (903) (890)
Total adjustments 1,460 (2,285)
Net cash provided by (used in) operating activities 2,205 (4,023)
Cash flows from investing activities:    
Purchase of property and equipment (116) (184)
Purchase of short-term investments 0 (1,697)
Proceeds from sales of assets 0 1
Proceeds from sales of short-term investments 0 1,700
Net cash used in investing activities (116) (180)
Cash flows from financing activities:    
Payment of finance lease obligations (3) 0
Repurchase of common stock (1,675) 0
Net cash used in financing activities (1,678) 0
Effect of exchange rate changes on cash and cash equivalents 21 (279)
Net increase (decrease) in cash and cash equivalents 432 (4,482)
Cash and cash equivalents, beginning of period 10,329 15,905
Cash and cash equivalents, end of period $ 10,761 $ 11,423
[1] For the three months ended March 31, 2020, there were 492 shares excluded from the diluted EPS calculation because the impact of their assumed vesting would be anti-dilutive due to a net loss in that period.