Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Net sales	$ 19,281		$ 15,990		$ 59,241	$ 42,281
Cost of sales	8,192		6,701		24,685	17,883
Gross profit	11,089		9,289		34,556	24,398
Operating expenses	11,078		10,528		32,856	29,204
Impairment expense	0		0		0	1,078
Income (loss) from operations	11		(1,239)		1,700	(5,884)
Other (income) expense:
Interest expense	2		2		12	2
Other, net	23		29		37	(75)
Total other (income) expense	25		31		49	(73)
Income (loss) before income taxes	(14)		(1,270)		1,651	(5,811)
Provision (benefit) for income taxes	2		(288)		382	(1,316)
Net income (loss)	(16)	[1]	(982)	[1]	1,269	(4,495)	[1]
Foreign currency translation adjustments, net of tax	(90)		133		(54)	(83)
Comprehensive income (loss)	$ (106)		$ (849)		$ 1,215	$ (4,578)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0		$ (0.11)		$ 0.15	$ (0.50)
Diluted (in dollars per share)	$ 0		$ (0.11)		$ 0.15	$ (0.50)
Weighted average number of shares outstanding:
Basic (in shares)	8,663,921	[1]	9,042,991	[1]	8,712,939	9,038,415	[1]
Diluted (in shares)	8,663,921	[1]	9,042,991	[1]	8,718,068	9,038,415	[1]

[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.