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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities:    
Net income $ 208 $ 4,682
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation of property, equipment and improvements 1,169 1,133
Amortization of intangible assets 2,448 2,540
Stock-based compensation 1,600 1,414
Deferred income tax provision 234 1,333
Gain on sale of property and equipment 0 (4,396)
Change in fair value of contingent consideration 259 243
Provision for bad debt and product returns 50 206
Provision for inventory obsolescence 455 450
Restructuring reversal 0 (67)
Other 161 113
Changes in operating assets and liabilities (net of acquisitions) (28,651) (1,540)
Net cash (used in) provided by operating activities (22,067) 6,111
Investing activities:    
Proceeds from maturities and sales of marketable securities 0 491
Acquisition of businesses, net of cash acquired (136,098) 0
Proceeds from sale of property and equipment 0 10,047
Purchase of property, equipment, improvements and certain other intangible assets (196) (1,775)
Net cash (used in) provided by investing activities (136,294) 8,763
Financing activities:    
Proceeds from long-term debt 110,000 0
Payments for contingent consideration 0 (161)
Proceeds from stock option plan transactions 4,160 662
Proceeds from employee stock purchase plan transactions 286 289
Purchases of common stock (1,577) (964)
Net cash provided by (used in) financing activities 112,869 (174)
Effect of exchange rate changes on cash and cash equivalents 1,772 (492)
Net (decrease) increase in cash and cash equivalents (43,720) 14,208
Cash and cash equivalents, beginning of period 92,792 58,014
Cash and cash equivalents, end of period 49,072 72,222
Supplemental schedule of non-cash investing and financing activities    
Transfer of inventory to property, equipment and improvements (186) (200)
Contingent consideration recognized related to acquisition of business (9,100) 0
Accrual for purchase of property, equipment, improvements and certain other intangible assets $ 0 $ (2,883)