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Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Sales	$ 14,462	$ 14,972	$ 29,570	$ 28,277
Cost of goods sold	7,777	8,370	16,100	15,481
Gross profit	6,685	6,602	13,470	12,796
Operating expenses:
Research and development	2,203	2,418	4,541	4,688
Sales and marketing	2,229	4,095	4,503	6,979
General and administrative	1,757	3,738	3,752	5,942
Total operating expenses	6,189	10,251	12,796	17,609
Income (loss) from operations	496	(3,649)	674	(4,813)
Other expense (income):
Interest income	(189)	(129)	(377)	(239)
Gain on deferred purchase price liability		(389)		(389)
Interest expense		10	1	24
Total other income	(189)	(508)	(376)	(604)
Income (loss) before income taxes	685	(3,141)	1,050	(4,209)
Provision for income taxes	23	49	52	87
Net income (loss)	$ 662	$ (3,190)	$ 998	$ (4,296)
Net income (loss) per share:
Basic	$ 0.07	$ (0.34)	$ 0.10	$ (0.45)
Diluted	$ 0.07	$ (0.34)	$ 0.10	$ (0.45)
Weighted average shares used in calculating income (loss) per share:
Basic	9,696,876	9,439,025	9,661,474	9,459,272
Diluted	10,127,719	9,439,025	10,071,300	9,459,272

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