Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net revenue	$ 11,601	$ 11,524	$ 33,543	$ 33,686
Cost of revenue	5,017	5,126	15,051	15,776
Gross profit	6,584	6,398	18,492	17,910
Operating expenses:
Selling, general and administrative	4,241	4,414	12,400	12,129
Research and development	1,964	2,126	6,059	5,944
Total operating expenses	6,205	6,540	18,459	18,073
Income (loss) from operations	379	(142)	33	(163)
Interest expense, net	(5)	(5)	(14)	(18)
Other income (expense), net	(1)	2	1	3
Income (loss) before income taxes	373	(145)	20	(178)
Provision for income taxes	29	17	92	47
Net income (loss)	$ 344	$ (162)	$ (72)	$ (225)
Net income (loss) per share (basic)	$ .02	$ (.01)	$ (0.00)	$ (0.01)
Net income (loss) per share (diluted)	$ .02	$ (0.01)	$ 0.00	$ (0.01)
Weighted-average common shares (basic)	18,210	17,522	18,050	17,374
Weighted-average common shares (diluted)	19,118	17,522	18,050	17,374