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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income (loss) $ 13,100 $ 6,267 $ (819)
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 1,399 1,058 752
Amortization of intangible assets 1,236 1,298 649
Equity-based compensation 6,236 4,015 5,011
Realized (gain) loss, net on sale of available-for-sale marketable securities 9 78 (6)
Amortization of premiums on available-for-sale marketable securities 1,064 1,111 1,121
Unrealized foreign exchange loss, net 75 237 604
Loss on realization of investment in other company     404
Changes in operating assets and liabilities:      
Trade receivables (10,966) 4,279 (2,381)
Prepaid expenses and other current assets (622) (136) 819
Accrued interest on bank deposits (195) (318) 351
Deferred tax, net (613) (1,213) 2,531
Trade payables (190) (161) (655)
Deferred revenues 3,495 1,082 950
Accrued expenses and other payables (277) (158) (188)
Accretion of contingent consideration   97 169
Accrued payroll and related benefits (94) 1,679 800
Income taxes payable 668 93 (1,057)
Excess tax benefit from equity-based compensation   (112)  
Accrued severance pay, net 134 184 54
Net cash provided by operating activities 14,459 19,380 9,109
Cash flows from investing activities:      
Acquisition of subsidiary, net of cash acquired (Note 2)     (13,489)
Purchase of property and equipment (2,387) (2,184) (1,416)
Investment in bank deposits (41,476) (53,328) (51,511)
Proceeds from bank deposits 37,594 47,451 45,306
Investment in available-for-sale marketable securities (43,537) (29,800) (38,413)
Proceeds from maturity of available-for-sale marketable securities 8,022 4,392 2,033
Proceeds from sale of available-for-sale marketable securities 20,754 23,713 55,566
Proceeds from realization of investment in other company   111 1,032
Net cash used in investing activities (21,030) (9,645) (892)
Cash flows from financing activities:      
Payment of contingent consideration (Note 2)   (3,700)  
Purchase of Treasury Stock (3,417) (10,078) (18,657)
Proceeds from exercise of stock-based awards 9,615 6,713 2,974
Excess tax benefit from equity-based compensation 0 112 0
Net cash provided by (used in) financing activities 6,198 (6,953) (15,683)
Effect of exchange rate changes on cash and cash equivalents (135) (39) (485)
Increase (decrease) in cash and cash equivalents (508) 2,743 (7,951)
Cash and cash equivalents at the beginning of the year 18,909 16,166 24,117
Cash and cash equivalents at the end of the year 18,401 18,909 16,166
Supplemental information of cash-flows activities:      
Income and withholding taxes, net of refunds 3,287 $ 2,185 $ 1,276
Property and equipment purchases incurred but unpaid at period end $ 86