Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Revenue	$ 308,632	$ 279,271	$ 254,203
Cost of sales:
Amortization	4,498	4,487	2,963
Total cost of sales	141,975	135,299	135,168
Gross profit	166,657	143,972	119,035
Operating expenses:
Sales and marketing	61,909	52,761	45,801
Research and development	46,623	43,765	37,564
General and administrative	46,602	36,012	25,685
Restructuring charge (reversal)	995	117	(87)
Total operating expenses	156,129	132,655	108,963
Operating income	10,528	11,317	10,072
Other (expense) income, net:
Interest income	10	304	733
Interest expense	(1,395)	(3,592)	(102)
Other (expense) income, net	(144)	(566)	442
Total other (expense) income, net	(1,529)	(3,854)	1,073
Income before income taxes	8,999	7,463	11,145
Income tax (benefit) expense	(1,367)	(948)	1,187
Net income	$ 10,366	$ 8,411	$ 9,958
Net income per common share:
Basic	$ 0.32	$ 0.29	$ 0.36
Diluted net income per common share:
Diluted	$ 0.31	$ 0.28	$ 0.35
Weighted average common shares:
Basic (shares)	32,111,000	28,849,000	27,905,000
Diluted (shares)	33,394,000	29,546,000	28,554,000
Product
Revenue:
Revenue	$ 265,805	$ 248,374	$ 224,530
Cost of sales:
Cost of sales	124,065	118,322	118,855
Service
Revenue:
Revenue	42,827	30,897	29,673
Cost of sales:
Cost of sales	$ 13,412	$ 12,490	$ 13,350