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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Operating activities: |  |
Net income | $ 3,124 | $ 2,167
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation expense | 3,132 | 2,747
Amortization of intangible assets | 2,175 | 1,693
Depreciation and amortization | 284 | 390
Amortization of investment premiums & other | 480 | 72
Accretion and amortization on debt securities | 1,715 | 0
Net changes in estimated fair value of acquisition-related contingent consideration | 30 | 0
Deferred taxes | (348) | (669)
Changes in assets and liabilities: |  |
Accounts receivable | (402) | 3,084
Contract assets | (175) | 1,529
Other assets | (864) | (342)
Accounts payable | 80 | (501)
Accrued payroll and related taxes | (4,518) | (2,514)
Deferred revenue | (2,496) | 1,273
Other liabilities | 34 | (199)
Net cash provided by operating activities | 2,251 | 8,730
Investing activities: |  |
Purchases of investments | (35,309) | (12,111)
Sales and maturities of investments | 37,658 | 8,141
Purchases of property and equipment | (295) | (400)
Net cash provided by (used in) investing activities | 2,054 | (4,370)
Financing activities: |  |
Proceeds from the issuance of equity plan common stock | 25 | 1,889
Repurchases and retirements of common stock | (10,145) | 0
Principal payments on other borrowings | (17) | (18)
Net cash provided by (used in) financing activities | (10,137) | 1,871
Foreign currency effect on cash and cash equivalents | (266) | 506
Net increase (decrease) in cash and cash equivalents | (6,098) | 6,737
Cash and cash equivalents at beginning of period | 30,312 | 19,986
Cash and cash equivalents at end of period | 24,214 | 26,723
Supplemental disclosures of cash flow information: |  |
Cash paid for income taxes | 170 | 149
Supplemental disclosures of non-cash investing and financing activities: |  |
Unrealized holding loss on available for sale investments | $ (270) | $ (53)

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations 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 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations 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 (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 + Details
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