Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (10,350)	$ (12,670)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	497	344
Stock-based compensation	$ 2,624	1,685
Capital gain from disposal of fixed asset		(1)
Changes in assets and liabilities:
Trade receivables	$ 23,036	17,226
Prepaid expenses and other current assets	(648)	1,064
Trade payables	(1,910)	(581)
Accrued expenses and other liabilities	(4,580)	$ (2,394)
Severance pay, net	(4)
Deferred revenues	(2,702)	$ (2,101)
Other long term liabilities	(521)	(1,327)
Net cash provided by operating activities	5,442	$ 1,245
Cash flows from investing activities:
Increase in short-term deposit	(250)
Decrease (increase) in restricted cash	(17)	$ 6
Purchase of property and equipment	(722)	(473)
Net cash used in investing activities	(989)	(467)
Cash flows from financing activities:
Proceeds from employee stock plans	761	548
Net cash provided by financing activities	761	548
Increase in cash and cash equivalents	5,214	1,326
Cash and cash equivalents at beginning of period	49,241	76,593
Cash and cash equivalents at end of period	$ 54,455	77,919
Supplemental disclosure of non-cash flow information:
Deferred rent fixed asset additions		1,355
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 66	$ 33