INTERIM CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,700	$ 21,739
Short term bank deposits	32,549	34,432
Marketable securities	82,446	82,664
Trade receivables	9,246	14,480
Accrued revenues	8,753	2,014
Prepaid expenses and other current assets	6,244	3,747
Total current assets	149,938	159,076
Long term bank deposits	47,134	44,518
Severance pay fund	9,022	8,910
Deferred tax assets	4,454	3,643
Property and equipment, net	8,100	6,926
Goodwill	46,612	46,612
Intangible assets, net	3,307	1,742
Investments in other company	1,806	1,806
Other long-term assets	4,444	3,579
Total long-term assets	124,879	117,736
Total assets	274,817	276,812
Current liabilities:
Trade payables	1,034	392
Deferred revenues	2,717	4,399
Accrued expenses and other payables	4,543	3,927
Accrued payroll and related benefits	12,556	14,077
Total current liabilities	20,850	22,795
Long term liabilities:
Accrued severance pay	9,601	9,347
Total long-term liabilities	9,601	9,347
Stockholders' equity:
Preferred Stock: $0.001 par value: 5,000,000 shares authorized; none issued and outstanding
Common Stock: $0.001 par value: 60,000,000 shares authorized; 23,595,160 shares issued at June 30, 2018 (unaudited) and December 31, 2017. 22,030,598 and 22,064,007 shares outstanding at June 30, 2018 (unaudited) and December 31, 2017, respectively	22	22
Additional paid in-capital	219,333	217,417
Treasury stock at cost (1,564,562 and 1,531,153 shares of common stock at June 30, 2018 (unaudited) and December 31, 2017, respectively)	(31,640)	(26,056)
Accumulated other comprehensive loss	(1,417)	(586)
Retained earnings	58,068	53,873
Total stockholders' equity	244,366	244,670
Total liabilities and stockholders' equity	$ 274,817	$ 276,812