Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (21,232)	$ (23,917)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	1,610	1,051
Stock-based compensation	9,455	5,704
Capital gain from disposal of fixed asset	(2)	(2)
Changes in assets and liabilities:
Trade receivables	17,311	9,683
Prepaid expenses and other current assets	(930)	688
Trade payables	(1,668)	(488)
Accrued expenses and other liabilities	(502)	2,301
Severance pay	28	29
Deferred revenues	402	664
Other long term liabilities	64	(346)
Net cash provided by (used in) operating activities	4,536	(4,633)
Cash flows from investing activities:
Increase in short-term deposit	(13,250)
Decrease (increase) in long-term deposits	(27)	11
Increase in restricted cash	(41)	(154)
Proceeds from sale of property and equipment	2
Purchase of property and equipment	(2,576)	(3,537)
Net cash used in investing activities	(15,892)	(3,680)
Cash flows from financing activities:
Proceeds from employee stock plans	3,803	1,647
Net cash provided by financing activities	3,803	1,647
Decrease in cash and cash equivalents	(7,553)	(6,666)
Cash and cash equivalents at beginning of period	49,241	76,593
Cash and cash equivalents at end of period	41,688	69,927
Supplemental disclosure of non-cash flow information:
Deferred rent fixed asset additions	37	1,355
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 133	$ 216