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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Operating activities: |  |  |
Net income (loss) | $ (724) | $ (11,807) | $ 14,092
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Stock-based compensation expense | 9,637 | 8,950 | 5,478
Amortization of closing shares and earnout shares | 0 | 355 | 1,579
Amortization of acquisition-related intangible assets | 7,024 | 4,023 | 591
Depreciation and other amortization | 1,388 | 615 | 322
Accretion and amortization on debt securities and other | (134) | (14) | 30
Net change in the estimated fair value of acquisition-related contingent consideration | 472 | 1,750 | 0
Deferred income taxes | (3,775) | 3,636 | (11,065)
Changes in assets and liabilities: |  |  |
Accounts receivable | 1,564 | (5,673) | (2,101)
Contract assets | (1,757) |  |
Other assets | (769) | (1,676) | 249
Accounts payable | 28 | 309 | 593
Accrued payroll and related taxes | (1,529) | 2,553 | 429
Deferred revenue | 1,125 | 1,670 | (269)
Restructuring accrual | 1,573 | 0 | 0
Other liabilities | 127 | 935 | 517
Net cash provided by operating activities | 14,250 | 5,626 | 10,445
Investing activities: |  |  |
Purchases of investments | (24,410) | (15,391) | (39,939)
Sales and maturities of investments | 14,966 | 41,018 | 32,650
Payments for business acquisitions, net of cash acquired | 0 | (29,744) | 0
Purchases of property and equipment | (1,063) | (4,307) | (488)
Net cash used in investing activities | (10,507) | (8,424) | (7,777)
Financing activities: |  |  |
Proceeds from the issuance of equity plan common stock | 5,581 | 1,125 | 687
Payment for acquisition-related contingent consideration | (1,030) | (1,284) | 0
Proceeds from other borrowings | 128 | 0 | 0
Principal payments on other borrowings | (296) | (270) | 0
Net cash provided by (used in) financing activities | 4,383 | (429) | 687
Foreign currency effect on cash and cash equivalents | (406) | (34) | (76)
Net increase (decrease) in cash and cash equivalents | 7,720 | (3,261) | 3,279
Cash and cash equivalents at beginning of period | 9,028 | 12,289 | 9,010
Cash and cash equivalents at end of period | 16,748 | 9,028 | 12,289
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | 0 | 29 | 0
Cash paid for income taxes | 310 | 402 | 113
Supplemental disclosures of non-cash investing and financing activities: |  |  |
Unrealized holding gain (loss) on available for sale investments | $ 29 | $ (10) | $ (19)

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + 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=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + 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=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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