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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (4,272) $ 8,015
Adjustments required to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 1,190 923
Amortization of intangible assets 635 618
Equity-based compensation 5,616 4,127
Realized (gain) loss, net on sale of available-for-sale marketable securities (2) 40
Amortization of premiums on available-for-sale marketable securities 430 619
Unrealized foreign exchange loss 78 29
Changes in operating assets and liabilities:    
Trade receivables and accrued revenues 7,694 4,655
Prepaid expenses and other assets (3,895) (2,382)
Accrued interest on bank deposits (533) 323
Deferred tax, net (677) (490)
Trade payables 533 (285)
Deferred revenues (1,682) (2,870)
Accrued expenses and other payables (289) 339
Accrued payroll and related benefits (1,277) (1,675)
Income taxes payable 78 (1,475)
Accrued severance pay, net 174 41
Net cash provided by operating activities 3,801 10,552
Cash flows from investing activities:    
Purchase of property and equipment (2,250) (2,275)
Purchase of intangible assets (1,690)  
Investment in bank deposits (11,396) (30,757)
Proceeds from bank deposits 11,065 27,050
Investment in available-for-sale marketable securities (13,834) (27,825)
Proceeds from maturity of available-for-sale marketable securities 9,392 3,895
Proceeds from sale of available-for-sale marketable securities 3,351 12,196
Net cash used in investing activities (5,362) (17,716)
Cash flows from financing activities:    
Purchase of treasury stock (10,434)  
Proceeds from exercise of stock-based awards 1,062 5,741
Net cash provided by (used in) financing activities (9,372) 5,741
Effect of exchange rate changes on cash and cash equivalents (106) 125
Decrease in cash and cash equivalents (11,039) (1,298)
Cash and cash equivalents at the beginning of the period 21,739 18,401
Cash and cash equivalents at the end of the period 10,700 17,103
Supplemental information of cash-flow activities:    
Income and withholding taxes, net of refunds 2,730 $ 2,505
Non-cash transactions:    
Cumulative effect of adoption of new accounting standard 8,555  
Property and equipment purchases incurred but unpaid at period end 114  
Intangible assets purchases incurred but unpaid at period end $ 750