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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
OPERATING ACTIVITIES |  |  |
Net income | $ 14,092 | $ 1,959 | $ 2,526
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation expense | 5,478 | 4,079 | 3,367
Amortization of closing and earnout shares | 1,579 | 1,503 | 393
Amortization of intangible assets | 591 | 598 | 172
Depreciation | 322 | 790 | 433
Amortization of investment premiums and other | 30 | 149 | 435
Deferred taxes | (11,065) | (127) | (647)
Changes in assets and liabilities: |  |  |
Accounts receivable | (2,101) | (1,002) | (566)
Other assets | 249 | (586) | (533)
Accounts payable | 593 | (222) | (449)
Accrued payroll and related taxes | 429 | 1,197 | 480
Deferred revenue | (269) | (67) | 478
Other liabilities | 517 | (417) | 16
Net cash provided by operating activities | 10,445 | 7,854 | 6,105
INVESTING ACTIVITIES |  |  |
Purchases of investments | (39,939) | (33,658) | (27,254)
Sales and maturities of investments | 32,650 | 30,623 | 21,406
Acquisition, net of cash acquired | 0 | 0 | (5,423)
Purchases of property and equipment | (488) | (250) | (73)
Net cash used in investing activities | (7,777) | (3,285) | (11,344)
FINANCING ACTIVITIES |  |  |
Proceeds from exercise of stock options | 687 | 1,755 | 246
Principal payments on capital lease obligations | 0 | (22) | (20)
Net cash provided by financing activities | 687 | 1,733 | 226
Foreign currency effect on cash and cash equivalents | (76) | (45) | (1)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 3,279 | 6,257 | (5,014)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 9,010 | 2,753 | 7,767
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 12,289 | 9,010 | 2,753
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |  |
Cash paid for interest | 0 | 1 | 4
Cash paid for income taxes | 113 | 17 | 105
NON-CASH FINANCING AND INVESTING ACTIVITIES |  |  |
Settlement of note receivable as consideration for business acquisition | 0 | 0 | 250
Unrealized holding gain (loss) on available for sale investments | $ (19) | $ 7 | $ 5

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration