INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 13,865	$ 7,899
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation	1,447	998
Amortization of intangible assets	927	927
Equity-based compensation	6,346	4,648
Realized loss, net on sale of available-for-sale marketable securities	33	16
Amortization of premiums on available-for-sale marketable securities	907	757
Unrealized foreign exchange gain loss	(24)	(29)
Changes in operating assets and liabilities:
Trade receivables	2,159	(13,172)
Prepaid expenses and other assets	(2,572)	(1,403)
Accrued interest on bank deposits	(3)	(395)
Deferred tax, net	(741)	(571)
Trade payables	(105)	370
Deferred revenues	(1,984)	1,269
Accrued expenses and other payables	416	(62)
Accrued payroll and related benefits	(1,532)	(356)
Income taxes payable	(1,501)	894
Accrued severance pay, net	60	176
Net cash provided by operating activities	17,698	1,966
Cash flows from investing activities:
Purchase of property and equipment	(3,340)	(2,031)
Investment in bank deposits	(30,757)	(19,100)
Proceeds from bank deposits	27,050	25,613
Investment in available-for-sale marketable securities	(36,468)	(32,498)
Proceeds from maturity of available-for-sale marketable securities	8,086	7,316
Proceeds from sale of available-for-sale marketable securities	15,206	14,253
Net cash used in investing activities	(20,223)	(6,447)
Cash flows from financing activities:
Purchase of treasury stock		(3,417)
Proceeds from exercise of stock-based awards	6,898	8,998
Net cash provided by financing activities	6,898	5,581
Effect of exchange rate changes on cash and cash equivalents	157	(11)
Increase in cash and cash equivalents	4,530	1,089
Cash and cash equivalents at the beginning of the period	18,401	18,909
Cash and cash equivalents at the end of the period	22,931	19,998
Supplemental information of cash-flow activities:
Income and withholding taxes, net of refunds	$ 3,934	1,604
Non-cash transactions:
Property and equipment purchases incurred but unpaid at period end		$ 67