Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 1,269	$ (4,495)	[1]
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	805	781
Operating lease asset amortization	2,408	2,425
Impairment of long-lived assets	0	1,078
(Gain) loss on disposal of assets	(11)	143
Stock-based compensation	593	629
Deferred income taxes	19	(176)
Exchange (gain) loss	23	(1)
Changes in operating assets and liabilities:
Accounts receivable-trade	(104)	15
Inventory	(6,584)	(10,757)
Prepaid expenses	(173)	423
Other current assets	13	59
Accounts payable-trade	830	1,481
Accrued expenses and other liabilities	118	244
Income taxes, net	1,357	(1,082)
Other assets	(6)	(2,488)
Operating lease liabilities	(2,585)	(2,548)
Total adjustments	(3,297)	(9,774)
Net cash used in operating activities	(2,028)	(14,269)
Cash flows from investing activities:
Purchase of property and equipment	(523)	(1,164)
Purchase of short-term investments	0	(1,697)
Proceeds from sales of assets	11	1
Proceeds from sales of short-term investments	0	10,910
Net cash provided by (used in) investing activities	(512)	8,050
Cash flows from financing activities:
Proceeds from long-term debt	0	410
Payment of finance lease obligations	(10)	0
Purchase of vested stock for employee payroll tax withholding	(15)	0
Purchase of common stock	(1,675)	0
Net cash provided by (used in) financing activities	(1,700)	410
Effect of exchange rate changes on cash and cash equivalents	(3)	60
Net decrease in cash and cash equivalents	(4,243)	(5,749)
Cash and cash equivalents, beginning of period	10,329	15,905
Cash and cash equivalents, end of period	$ 6,086	$ 10,156

[1] For the three months ended September 30, 2021, there were 15,326 shares excluded from the diluted EPS calculation, and for the three and nine months ended September 30, 2020, there were 1,875 and 7,422 shares, respectively, excluded from the diluted EPS calculation because the impact of their assumed vesting would be anti-dilutive due to a net loss in those respective periods.