Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income (loss)		$ 7,672	$ (1,709)	[1]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of property, equipment and improvements		3,343	2,440	[1]
Amortization of intangible assets		6,669	6,866	[1]
Stock-based compensation		4,180	3,598	[1]
Deferred income tax provision		1,189	2,781	[1]
Gain on sale of property and equipment		(4,458)	(8)	[1]
Change in fair value of contingent consideration		1,188	333	[1]
Provision for bad debt and product returns		594	404	[1]
Provision for inventory obsolescence		1,350	1,550	[1]
Restructuring (reversal) charge		(87)	190	[1]
Other		131	(58)	[1]
Changes in operating assets and liabilities (net of acquisitions)		757	(25,231)	[1]
Net cash provided by (used in) operating activities		22,528	(8,844)	[1]
Investing activities:
Proceeds from maturities and sales of marketable securities		2,500	29,752	[1]
Proceeds from sale of business		0	2,000	[1]
Acquisition of businesses, net of cash acquired		0	(56,588)	[1]
Proceeds from sale of property and equipment		10,047	0	[1]
Purchase of property, equipment, improvements and certain other intangible assets		(8,600)	(963)	[1]
Net cash provided by (used in) investing activities		3,947	(25,799)	[1]
Financing activities:
Acquisition earn-out payments		(3,748)	0	[1]
Proceeds from stock option plan transactions		4,054	3,871	[1]
Proceeds from employee stock purchase plan transactions		835	892	[1]
Purchases of common stock		(1,051)	(730)	[1]
Net cash provided by financing activities		90	4,033	[1]
Effect of exchange rate changes on cash and cash equivalents		(485)	82	[1]
Net increase (decrease) in cash and cash equivalents		26,080	(30,528)	[1]
Cash and cash equivalents, beginning of period	[1]	58,014	78,222
Cash and cash equivalents, end of period		84,094	47,694	[1]
Supplemental schedule of non-cash investing and financing activities
Transfer of inventory to property, equipment and improvements		(921)	(1,750)	[1]
Liability related to acquisition of business		0	(2,300)	[1]
Accrual for purchase of property, equipment, improvements and certain other intangible assets		$ (7)	$ 0	[1]

[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.