Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Product	$ 47,588	$ 41,766	$ 86,042	$ 84,939
Services and solutions	7,203	3,849	13,946	5,851
Total revenue	54,791	45,615	99,988	90,790
Cost of sales:
Cost of product	23,080	21,398	42,290	43,735
Cost of services and solutions	4,287	2,003	7,730	3,177
Amortization of intangibles	770	312	1,377	523
Total cost of sales	28,137	23,713	51,397	47,435
Gross profit	26,654	21,902	48,591	43,355
Operating expenses:
Sales and marketing	11,175	8,731	20,935	17,053
Research and development	8,617	6,979	16,368	13,884
General and administrative	6,359	4,680	12,908	8,484
Total operating expenses	26,151	20,390	50,211	39,421
Operating income (loss)	503	1,512	(1,620)	3,934
Other (expense) income, net:
Interest income	38	120	246	279
Interest expense	(4)	(10)	(7)	(43)
Other (expense) income, net	(527)	(143)	(572)	431
Total other (expense) income, net	(493)	(33)	(333)	667
Income (loss) before income taxes	10	1,479	(1,953)	4,601
Income tax provision	367	148	2,973	913
Net (loss) income	$ (357)	$ 1,331	$ (4,926)	$ 3,688
Basic net (loss) income per common share:
Net (loss) income, basic (USD per share)	$ (0.01)	$ 0.05	$ (0.18)	$ 0.14
Diluted net (loss) income per common share
Net (loss) income, diluted (USD per share)	$ (0.01)	$ 0.05	$ (0.18)	$ 0.14
Weighted average common shares:
Basic (shares)	27,084	26,477	26,914	26,324
Diluted (shares)	27,084	27,252	26,914	27,134