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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net income $ 2,621 $ 2,212
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation of property, equipment and improvements 2,164 2,289
Amortization of intangible assets 7,888 6,564
Stock-based compensation 4,222 3,441
Deferred income tax provision 682 756
Loss on sale of property and equipment 70 0
Change in fair value of contingent consideration 5,772 (128)
Provision for bad debt and product returns 621 108
Provision for inventory obsolescence 1,200 516
Restructuring charge 894 38
Other (8) 50
Changes in operating assets and liabilities (net of acquisitions) (4,829) (28,529)
Net cash provided by (used in) operating activities 21,297 (12,683)
Investing activities:    
Acquisition of business, net of cash acquired (7,095) (136,098)
Purchase of property, equipment, improvements and certain other intangible assets (1,287) (434)
Net cash used in investing activities (8,382) (136,532)
Financing activities:    
Proceeds from long-term debt 618 110,000
Payments on long-term debt (15,625) (625)
Payments for contingent consideration (4,200) 0
Proceeds from issuance of stock, net of offering expenses 73,830 0
Proceeds from stock option plan transactions 6,620 4,724
Proceeds from employee stock purchase plan transactions 619 516
Purchases of common stock (1,865) (1,684)
Net cash provided by financing activities 59,997 112,931
Effect of exchange rate changes on cash and cash equivalents 148 1,578
Net increase (decrease) in cash and cash equivalents 73,060 (34,706)
Cash and cash equivalents, beginning of period 54,129 92,792
Cash and cash equivalents, end of period 127,189 58,086
Supplemental schedule of non-cash investing and financing activities    
Transfer of inventory to property, equipment and improvements (1,399) (743)
Contingent consideration recognized related to acquisition of business (8,000) (5,100)
Tenant improvement allowance (1,000) 0
Accrual for purchase of property, equipment, improvements and certain other intangible assets $ (283) $ 0