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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Operating activities      
Net income (loss) $ (11,807) $ 14,092 $ 1,959
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Stock-based compensation expense 8,950 5,478 4,079
Amortization of closing shares and earnout shares 355 1,579 1,503
Amortization of acquisition-related intangible assets 4,023 591 598
Depreciation and other amortization 615 322 790
Accretion and amortization on debt securities and other (14) 30 149
Net change in the estimated fair value of acquisition-related contingent consideration 1,750 0 0
Deferred income taxes 3,636 (11,065) (127)
Changes in assets and liabilities:      
Accounts receivable (5,673) (2,101) (1,002)
Other assets (1,676) 249 (586)
Accounts payable 309 593 (222)
Accrued payroll and related taxes 2,553 429 1,197
Deferred revenue 1,670 (269) (67)
Other liabilities 935 517 (417)
Net cash provided by operating activities 5,626 10,445 7,854
Investing activities      
Purchases of investments (15,391) (39,939) (33,658)
Sales and maturities of investments 41,018 32,650 30,623
Payments for business acquisitions, net of cash acquired (29,744) 0 0
Purchases of property and equipment (4,307) (488) (250)
Net cash used in investing activities (8,424) (7,777) (3,285)
Financing activities      
Proceeds from the issuance of equity plan common stock 1,125 687 1,755
Payment for aquisition-related contingent consideration (1,284) 0 0
Principal payments on capital lease obligations 0 0 (22)
Principal payments on other borrowings (270) 0 0
Net cash provided by (used in) financing activities (429) 687 1,733
Foreign currency effect on cash and cash equivalents (34) (76) (45)
Net increase (decrease) in cash and cash equivalents (3,261) 3,279 6,257
Cash and cash equivalents at beginning of period 12,289 9,010 2,753
Cash and cash equivalents at end of period 9,028 12,289 9,010
Supplemental disclosures of cash flow information:      
Cash paid for interest 29 0 1
Cash paid for income taxes 402 113 17
Supplemental disclosures of non-cash investing and financing activities:      
Unrealized holding gain (loss) on available for sale investments $ (10) $ (19) $ 7