Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (15,914)	$ (16,843)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,284	1,066
Stock-based compensation	9,663	5,997
Capital gain from disposal of fixed assets	(2)
Changes in assets and liabilities:
Trade receivables	12,548	13,943
Prepaid expenses and other current assets	(1,783)	47
Trade payables	60	(538)
Accrued expenses and other short term liabilities	2,769	16
Severance pay	(192)	21
Deferred revenues	(694)	(1,144)
Other long term liabilities	(355)	(224)
Net cash provided by operating activities	7,384	2,341
Cash flows from investing activities:
Decrease (increase) in short-term investments	(2,556)	4,750
Increase in long-term deposits	(160)	(27)
Increase in restricted cash	(49)	(7)
Proceeds on sales of property and equipment	2
Purchase of property and equipment	(2,534)	(1,447)
Net cash provided by (used in) investing activities	(5,297)	3,269
Cash flows from financing activities:
Proceeds from employee stock plans, net	3,137	1,251
Net cash provided by financing activities	3,137	1,251
Increase in cash and cash equivalents	5,224	6,861
Cash and cash equivalents at beginning of period	48,315	49,241
Cash and cash equivalents at end of period	53,539	56,102
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 140	$ 96