Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenue:
Total Revenue	$ 77,301	$ 73,447	$ 150,447	$ 135,764
Cost of sales:
Amortization of intangibles	1,111	1,246	2,225	2,047
Total cost of sales	36,844	34,806	68,971	66,659
Gross Profit	40,457	38,641	81,476	69,105
Operating expenses:
Sales and marketing	15,437	14,556	30,361	26,617
Research and development	11,355	11,532	22,448	21,863
General and administrative	10,134	8,791	24,549	17,346
Restructuring charge	161	38	894	38
Total operating expenses	37,087	34,917	78,252	65,864
Operating income	3,370	3,724	3,224	3,241
Other expense, net:
Interest income	1	50	1	281
Interest expense	(246)	(1,734)	(648)	(2,166)
Other expense, net	77	89	(115)	(147)
Total other expense, net	(168)	(1,595)	(762)	(2,032)
Income before income taxes	3,202	2,129	2,462	1,209
Income tax expense (benefit)	274	125	(159)	(1,003)
Net income	$ 2,928	$ 2,004	$ 2,621	$ 2,212
Basic net income per common share:
Net income, basic (USD per share)	$ 0.09	$ 0.07	$ 0.09	$ 0.08
Diluted net income per common share
Net income, diluted (USD per share)	$ 0.09	$ 0.07	$ 0.08	$ 0.07
Weighted average common shares:
Basic (shares)	30,900	28,881	30,129	28,673
Diluted (shares)	32,223	29,486	31,436	29,585
Product
Revenue:
Revenue	$ 66,924	$ 65,641	$ 129,528	$ 119,888
Cost of sales:
Cost of sales excluding amortization	32,495	29,687	60,271	58,178
Service
Revenue:
Revenue	10,377	7,806	20,919	15,876
Cost of sales:
Cost of sales excluding amortization	$ 3,238	$ 3,873	$ 6,475	$ 6,434