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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

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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Period Type: | duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Balance Type: | debit
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- References No definition available. + Details
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