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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net (loss) income $ (4,926) $ 3,688
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation of property, equipment and improvements 1,406 1,449
Amortization of identifiable intangible assets 4,287 941
Stock-based compensation 2,378 2,328
Excess tax benefits from stock-based compensation 0 (315)
Deferred income tax provision 2,682 242
Change in fair value of contingent consideration (425) (684)
Bad debt/product return provision 395 296
Inventory obsolescence 900 600
Other 30 51
Changes in operating assets and liabilities (net of acquisitions) (11,708) (9,473)
Net cash used in operating activities (4,981) (877)
Investing activities:    
Purchase of marketable securities 0 (33,470)
Proceeds from maturities and sales of marketable securities 29,513 57,039
Proceeds from sale of Etherios 2,000 3,000
Acquisition of businesses, net of cash acquired (56,588) (29,994)
Purchase of property, equipment, improvements and certain other identifiable intangible assets (785) (984)
Net cash used in investing activities (25,860) (4,409)
Financing activities:    
Acquisition earn-out payments 0 (518)
Excess tax benefits from stock-based compensation 0 315
Proceeds from stock option plan transactions 3,427 3,246
Proceeds from employee stock purchase plan transactions 618 479
Purchases of common stock (681) (587)
Net cash provided by financing activities 3,364 2,935
Effect of exchange rate changes on cash and cash equivalents 1,646 (1,481)
Net decrease in cash and cash equivalents (25,831) (3,832)
Cash and cash equivalents, beginning of period 78,222 75,727
Cash and cash equivalents, end of period 52,391 71,895
Supplemental schedule of non-cash investing and financing activities    
Liability related to acquisition of businesses (2,300) (1,310)
Accrual for purchase of property, equipment, improvements and certain other identifiable intangible assets $ (27) $ (66)