Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net (loss) income	$ (4,569)	$ 2,357
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation of property, equipment and improvements	711	656
Amortization of identifiable intangible assets	1,694	345
Stock-based compensation	1,053	1,173
Excess tax benefits from stock-based compensation	0	(183)
Deferred income tax provision	2,954	619
Change in fair value of contingent consideration	(407)	(82)
Bad debt/product return provision	14	264
Inventory obsolescence	450	450
Other	57	(12)
Changes in operating assets and liabilities (net of acquisitions)	(3,285)	(7,622)
Net cash used in operating activities	(1,328)	(2,035)
Investing activities:
Purchase of marketable securities	0	(25,470)
Proceeds from maturities and sales of marketable securities	4,296	32,155
Proceeds from sale of Etherios	2,000	3,000
Acquisition of businesses, net of cash acquired	(40,084)	(1,690)
Purchase of property, equipment, improvements and certain other identifiable intangible assets	(453)	(554)
Net cash (used in) provided by investing activities	(34,241)	7,441
Financing activities:
Acquisition earn-out payments	0	(518)
Excess tax benefits from stock-based compensation	0	183
Proceeds from stock option plan transactions	2,972	2,787
Proceeds from employee stock purchase plan transactions	380	297
Purchases of common stock	(636)	(390)
Net cash provided by financing activities	2,716	2,359
Effect of exchange rate changes on cash and cash equivalents	241	(2,350)
Net (decrease) increase in cash and cash equivalents	(32,612)	5,415
Cash and cash equivalents, beginning of period	78,222	75,727
Cash and cash equivalents, end of period	45,610	81,142
Supplemental schedule of non-cash investing and financing activities
Liability related to acquisition of businesses	0	(1,300)
Accrual for purchase of property, equipment, improvements and certain other identifiable intangible assets	$ (27)	$ (105)