Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (16,843)	$ (18,992)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,066	689
Stock-based compensation	5,997	3,647
Capital gain from disposal of fixed asset		(1)
Changes in assets and liabilities:
Trade receivables	13,943	8,920
Prepaid expenses and other current assets	47	1,260
Trade payables	(538)	(119)
Accrued expenses and other liabilities	16	439
Severance pay, net	21	17
Deferred revenues	(1,144)	(597)
Other long term liabilities	(224)	(689)
Net cash provided by (used in) operating activities	2,341	(5,426)
Cash flows from investing activities:
Decrease in short-term deposit	4,750
Increase in long-term deposits	(27)	(65)
Increase in restricted cash	(7)	(173)
Purchase of property and equipment	(1,447)	(1,770)
Net cash provided by (used in) investing activities	3,269	(2,008)
Cash flows from financing activities:
Proceeds from employee stock plans	1,251	619
Net cash provided by financing activities	1,251	619
Increase (decrease) in cash and cash equivalents	6,861	(6,815)
Cash and cash equivalents at beginning of period	49,241	76,593
Cash and cash equivalents at end of period	56,102	69,778
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	$ 96	$ 163