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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 574,000 $ 17,028,000 $ 13,100,000
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation 2,915,000 2,014,000 1,399,000
Amortization of intangible assets 1,242,000 1,236,000 1,236,000
Equity-based compensation 10,367,000 8,693,000 6,236,000
Realized loss, net on sale of available-for-sale marketable securities 67,000 0 9,000
Amortization of premiums on available-for-sale marketable securities 773,000 1,179,000 1,064,000
Unrealized foreign exchange (gain) loss, net 155,000 (42,000) 75,000
Other than Temporary Impairment Losses, Investments, Total 870,000 0 0
Changes in operating assets and liabilities:      
Trade receivables (463,000) (1,446,000) (10,966,000)
Prepaid expenses and other assets (3,855,000) (2,478,000) (622,000)
Accrued interest on bank deposits (557,000) 151,000 (195,000)
Deferred tax, net (2,187,000) (1,375,000) (613,000)
Trade payables 226,000 (184,000) (190,000)
Deferred revenues (806,000) (1,859,000) 3,495,000
Accrued expenses and other payables (493,000) 1,259,000 (277,000)
Accrued payroll and related benefits (527,000) 1,807,000 (94,000)
Income taxes payable 96,000 (1,493,000) 668,000
Accrued severance pay, net 215,000 (21,000) 134,000
Net cash provided by operating activities 8,612,000 24,469,000 14,459,000
Cash flows from investing activities:      
Purchase of property and equipment (3,319,000) (4,135,000) (2,387,000)
Purchase of intangible assets (1,960,000) 0 0
Investment in bank deposits (21,596,000) (47,027,000) (41,476,000)
Proceeds from bank deposits 32,892,000 44,450,000 37,594,000
Investment in available-for-sale marketable securities (19,666,000) (54,882,000) (43,537,000)
Proceeds from maturity of available-for-sale marketable securities 10,122,000 9,296,000 8,022,000
Proceeds from sale of available-for-sale marketable securities 13,354,000 23,512,000 20,754,000
Net cash provided by (used in) investing activities 9,827,000 (28,786,000) (21,030,000)
Cash flows from financing activities:      
Purchase of Treasury Stock (20,008,000) 0 (3,417,000)
Proceeds from exercise of stock-based awards 2,249,000 7,487,000 9,615,000
Net cash provided by (used in) financing activities (17,759,000) 7,487,000 6,198,000
Effect of exchange rate changes on cash and cash equivalents (159,000) 168,000 (135,000)
Increase (decrease) in cash and cash equivalents 521,000 3,338,000 (508,000)
Cash and cash equivalents at the beginning of the year 21,739,000 18,401,000 18,909,000
Cash and cash equivalents at the end of the year 22,260,000 21,739,000 18,401,000
Supplemental information of cash-flows activities:      
Income and withholding taxes 4,294,000 5,203,000 3,287,000
Non-cash transactions:      
Cumulative effect of adoption of new accounting standard 8,555,000 0 0
Property and equipment purchases incurred but unpaid at period end 14,000 0 86,000
Intangible assets purchased but unpaid at period end $ 750,000