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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities:    
Net income $ 610 $ 260
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 2,308 2,161
Amortization of closing and earnout shares 752 779
Amortization of intangible assets 287 298
Depreciation and amortization 216 218
Accretion and amortization on debt securities 16 114
Changes in assets and liabilities:    
Accounts receivable (181) 1,439
Other assets 325 (242)
Accounts payable 510 69
Accrued payroll and related taxes (875) (111)
Deferred revenue 90 260
Other liabilities 314 (56)
Net cash provided by operating activities 4,372 5,189
Investing activities:    
Purchases of investments (12,317) (14,472)
Sales and maturities of investments 12,150 19,599
Purchases of property and equipment (254) (111)
Net cash provided by (used in) investing activities (421) 5,016
Financing activities:    
Proceeds from exercise of stock options, net 30 313
Principal payments on capital lease obligations 0 (11)
Net cash provided by financing activities 30 302
Foreign currency effect on cash and cash equivalents (32) (34)
Net increase in cash and cash equivalents 3,949 10,473
Cash and cash equivalents at beginning of period 9,010 2,753
Cash and cash equivalents at end of period 12,959 13,226
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 2
Cash paid for income taxes 36 74
Supplemental disclosures of non-cash investing and financing activities:    
Unrealized holding gain (loss) on available-for-sale investments $ (18) $ 7