Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net (loss) income	$ (2,305)	$ 5,023
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation of property, equipment and improvements	2,140	2,187
Amortization of identifiable intangible assets	6,866	1,842
Stock-based compensation	3,598	3,502
Excess tax benefits from stock-based compensation	0	(326)
Deferred income tax provision	2,551	(648)
Change in fair value of contingent consideration	333	(1,330)
Bad debt/product return provision	404	338
Inventory obsolescence	1,550	1,030
Restructuring charges	190	2,515
Other	(66)	138
Changes in operating assets and liabilities (net of acquisitions)	(24,105)	(14,729)
Net cash used in operating activities	(8,844)	(458)
Investing activities:
Purchase of marketable securities	0	(33,469)
Proceeds from maturities and sales of marketable securities	29,752	76,149
Proceeds from sale of Etherios	2,000	3,000
Acquisition of businesses, net of cash acquired	(56,588)	(30,111)
Purchase of property, equipment, improvements and certain other identifiable intangible assets	(963)	(1,577)
Net cash (used in) provided by investing activities	(25,799)	13,992
Financing activities:
Acquisition earn-out payments	0	(518)
Excess tax benefits from stock-based compensation	0	326
Proceeds from stock option plan transactions	3,871	3,264
Proceeds from employee stock purchase plan transactions	892	686
Purchases of common stock	(730)	(922)
Net cash provided by financing activities	4,033	2,836
Effect of exchange rate changes on cash and cash equivalents	82	(45)
Net (decrease) increase in cash and cash equivalents	(30,528)	16,325
Cash and cash equivalents, beginning of period	78,222	75,727
Cash and cash equivalents, end of period	47,694	92,052
Supplemental schedule of non-cash investing and financing activities
Liability related to acquisition of businesses	$ (2,300)	$ (1,310)