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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities:    
Net income $ 3,688 $ 8,587
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation of property, equipment and improvements 1,449 1,405
Amortization of identifiable intangible assets 941 1,001
Stock-based compensation 2,328 1,719
Excess tax benefits from stock-based compensation (315) (202)
Deferred income tax provision 242 1,397
Gain on sale of business 0 (2,870)
Change in fair value of contingent consideration (684) 123
Bad debt/product return provision 296 168
Inventory obsolescence 600 834
Restructuring charges 0 753
Other 51 59
Changes in operating assets and liabilities (net of acquisitions) (9,473) (1,486)
Net cash (used in) provided by operating activities (877) 11,488
Investing activities:    
Purchase of marketable securities (33,470) (22,056)
Proceeds from maturities and sales of marketable securities 57,039 27,509
Proceeds from sale of Etherios 3,000 2,849
Acquisition of businesses, net of cash acquired (29,994) (2,860)
Purchase of property, equipment, improvements and certain other identifiable intangible assets (984) (1,209)
Net cash (used in) provided by investing activities (4,409) 4,233
Financing activities:    
Acquisition earn-out payments (518) 0
Excess tax benefits from stock-based compensation 315 202
Proceeds from stock option plan transactions 3,246 6,267
Proceeds from employee stock purchase plan transactions 479 494
Purchases of common stock (587) (503)
Net cash provided by financing activities 2,935 6,460
Effect of exchange rate changes on cash and cash equivalents (1,481) 71
Net (decrease) increase in cash and cash equivalents (3,832) 22,252
Cash and cash equivalents, beginning of period 75,727 45,018
Cash and cash equivalents, end of period 71,895 67,270
Supplemental schedule of non-cash investing and financing activities    
Receivable related to sale of Etherios 0 4,906
Liability related to acquisition of businesses (1,310) (10,550)
Accrual for purchase of property, equipment, improvements and certain other identifiable intangible assets $ (66) $ 0