Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income (loss)		$ 4,682	$ (4,487)	[1]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of property, equipment and improvements		1,133	759	[1]
Amortization of identifiable intangible assets		2,540	1,694	[1]
Stock-based compensation		1,414	1,053	[1]
Deferred income tax provision		1,333	2,995	[1]
Gain on sale of property and equipment		(4,396)	0	[1]
Change in fair value of contingent consideration		243	(407)	[1]
Bad debt/product return provision		206	14	[1]
Inventory obsolescence		450	450	[1]
Restructuring reversal		(67)	0
Other		113	57	[1]
Changes in operating assets and liabilities (net of acquisitions)		(1,540)	(3,456)	[1]
Net cash provided by (used in) operating activities		6,111	(1,328)	[1]
Investing activities:
Proceeds from maturities and sales of marketable securities		491	4,296	[1]
Proceeds from sale of Etherios		0	2,000	[1]
Acquisition of businesses, net of cash acquired		0	(40,084)	[1]
Proceeds from sale of property and equipment		10,047	0	[1]
Purchase of property, equipment, improvements and certain other identifiable intangible assets		(1,775)	(453)	[1]
Net cash provided by (used in) investing activities		8,763	(34,241)	[1]
Financing activities:
Acquisition earn-out payments		(161)	0	[1]
Proceeds from stock option plan transactions		662	2,972	[1]
Proceeds from employee stock purchase plan transactions		289	380	[1]
Purchases of common stock		(964)	(636)	[1]
Net cash (used in) provided by financing activities		(174)	2,716	[1]
Effect of exchange rate changes on cash and cash equivalents		(492)	241	[1]
Net increase (decrease) in cash and cash equivalents		14,208	(32,612)	[1]
Cash and cash equivalents, beginning of period	[1]	58,014	78,222
Cash and cash equivalents, end of period		72,222	45,610	[1]
Supplemental schedule of non-cash investing and financing activities
Transfer of inventory to property, equipment and improvements		(200)	(312)	[1]
Accrual for purchase of property, equipment, improvements and certain other identifiable intangible assets		$ (2,883)	$ (27)	[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.