Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (18,992)	$ (12,713)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	689	534
Stock-based compensation	$ 3,647	1,624
Amortization of deferred charges related to loan		$ 31
Capital gain from disposal of fixed asset	$ (1)
Changes in assets and liabilities:
Trade receivables	8,920	$ 9,414
Prepaid expenses and other current assets	1,260	18
Trade payables	(119)	137
Accrued expenses and other liabilities	439	721
Increase in severance pay, net	17	339
Deferred revenues	(597)	(686)
Other long term liabilities	(689)	1
Net cash used in operating activities	$ (5,426)	(580)
Cash flows from investing activities:
Decrease in short-term deposit		4,242
Decrease (increase) in long-term deposits	$ (65)	46
Decrease (increase) in restricted cash	(173)	260
Purchase of property and equipment	(1,770)	(1,288)
Net cash provided by (used in) investing activities	(2,008)	3,260
Cash flows from financing activities:
Exercise of employee stock options	$ 619	30
Payment of deferred equity offering cost		(662)
Net proceeds from initial public offering		108,447
Net cash provided by financing activities	$ 619	107,815
Increase (decrease) in cash and cash equivalents	(6,815)	110,495
Cash and cash equivalents at beginning of period	76,593	9,633
Cash and cash equivalents at end of period	$ 69,778	120,128
Supplemental disclosures of non-cash flow information:
Conversion of preferred stock to common stock		43,775
Conversion of liability warrants to equity		$ 2,866
Deferred rent fixed asset additions	$ 1,355
Deferred offering costs not yet paid		$ 519
	$ 1,355	47,160
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 163	$ 46