Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Revenue	$ 279,271	$ 254,203	$ 226,893
Cost of sales:
Amortization	4,487	2,963	2,871
Total cost of sales	135,299	135,168	117,839
Gross profit	143,972	119,035	109,054
Operating expenses:
Sales and marketing	52,761	45,801	44,517
Research and development	43,765	37,564	33,178
General and administrative	36,012	25,685	28,276
Restructuring charge (reversal)	117	(87)	301
Total operating expenses	132,655	108,963	106,272
Operating income	11,317	10,072	2,782
Other (expense) income, net:
Interest income	304	733	445
Interest expense	(3,592)	(102)	(25)
Other (expense) income, net	(566)	442	48
Total other (expense) income, net	(3,854)	1,073	468
Income before income taxes	7,463	11,145	3,250
Income tax (benefit) expense	(948)	1,187	1,619
Net income	$ 8,411	$ 9,958	$ 1,631
Net income per common share:
Basic	$ 0.29	$ 0.36	$ 0.06
Diluted net income per common share:
Diluted	$ 0.28	$ 0.35	$ 0.06
Weighted average common shares:
Basic (shares)	28,849	27,905	27,083
Diluted (shares)	29,546	28,554	27,652
Product
Revenue:
Revenue	$ 248,374	$ 224,530	$ 201,737
Cost of sales:
Cost of sales	118,322	118,855	104,639
Service
Revenue:
Revenue	30,897	29,673	25,156
Cost of sales:
Cost of sales	$ 12,490	$ 13,350	$ 10,329