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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 1,863 $ 3,643
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 390 488
Stock-based compensation 465 374
Deferred tax benefit on other comprehensive income (9) (13)
Amortization of discount on investments (4) (9)
Gain on sale of investments (36)  
Changes in assets and liabilities:    
Accounts receivable (2,601) 493
Prepaid expenses and other current assets (47) 85
Deferred tax assets 188 (13)
Accounts payable 397 (37)
Accrued expenses 197 117
Accrued income taxes 12 (21)
Deferred revenue (204) (2,413)
Net cash provided by operating activities 611 2,694
Cash flows from investing activities:    
Purchases of property and equipment (61) (82)
Sales of investments 1,019  
Net cash provided by (used in) investing activities 958 (82)
Cash flows from financing activities:    
Proceeds from issuance of common stock 42 21
Excess tax benefits from stock-based compensation   700
Payments made for taxes of employees who surrendered shares related to unrestricted stock (186) (136)
Repurchase of common stock (4,213) (2,163)
Net cash used in financing activities (4,357) (1,578)
Increase (decrease) in cash and cash equivalents (2,788) 1,034
Cash and cash equivalents, beginning of period 51,913 51,232
Cash and cash equivalents, end of period 49,125 52,266
Supplemental disclosure:    
Cash paid for income taxes $ 473 $ 1,024