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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (1,729) $ 13,865
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 1,914 1,447
Amortization of intangible assets 938 927
Equity-based compensation 8,083 6,346
Realized loss, net on sale of available-for-sale marketable securities 30 33
Amortization of premiums on available-for-sale marketable securities 609 907
Unrealized foreign exchange (gain) loss 141 (24)
Changes in operating assets and liabilities:    
Trade receivables and accrued revenues 1,658 2,159
Prepaid expenses and other assets (3,815) (2,572)
Accrued interest on bank deposits (643) (3)
Deferred tax, net (949) (741)
Trade payables 557 (105)
Deferred revenues (785) (1,984)
Accrued expenses and other payables (802) 416
Accrued payroll and related benefits (1,329) (1,532)
Income taxes payable 55 (1,501)
Accrued severance pay, net 149 60
Net cash provided by operating activities 4,082 17,698
Cash flows from investing activities:    
Purchase of property and equipment (2,913) (3,340)
Purchase of intangible assets (1,960)  
Investment in bank deposits (21,596) (30,757)
Proceeds from bank deposits 22,065 27,050
Investment in available-for-sale marketable securities (15,516) (36,468)
Proceeds from maturity of available-for-sale marketable securities 10,122 8,086
Proceeds from sale of available-for-sale marketable securities 7,803 15,206
Net cash used in investing activities (1,995) (20,223)
Cash flows from financing activities:    
Purchase of treasury stock (16,742)  
Proceeds from exercise of stock-based awards 2,249 6,898
Net cash provided by (used in) financing activities (14,493) 6,898
Effect of exchange rate changes on cash and cash equivalents (121) 157
Increase (decrease) in cash and cash equivalents (12,527) 4,530
Cash and cash equivalents at the beginning of the period 21,739 18,401
Cash and cash equivalents at the end of the period 9,212 22,931
Supplemental information of cash-flow activities:    
Income and withholding taxes, net of refunds 3,716 $ 3,934
Non-cash transactions:    
Cumulative effect of adoption of new accounting standard 8,555  
Property and equipment purchases incurred but unpaid at period end 54  
Intangible assets purchases incurred but unpaid at period end $ 750