Unaudited Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (12,670)	$ (8,074)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	344	254
Stock-based compensation	1,685	646
Amortization of deferred charges related to loan		31
Capital loss from disposal of fixed asset	(1)
Changes in assets and liabilities:
Trade receivables	17,226	14,014
Prepaid expenses and other current assets	1,064	(284)
Trade payables	(581)	(74)
Accrued expenses and other liabilities	(2,394)	(1,069)
Increase in severance pay, net		314
Deferred revenues	(2,101)	(1,424)
Other long term liabilities	(1,327)	3
Net cash provided by operating activities	1,245	4,337
Cash flows from investing activities:
Decrease in short-term deposit		3,987
Decrease in long-term deposits		37
Decrease (increase) in restricted cash	6	(15)
Purchase of property and equipment	(473)	(608)
Net cash provided by (used in) investing activities	(467)	3,401
Cash flows from financing activities:
Exercise of employee stock options	548	13
Payment of deferred equity offering cost		(335)
Net proceeds from initial public offering		108,447
Net cash provided by financing activities	548	108,125
Increase in cash and cash equivalents	1,326	115,863
Cash and cash equivalents at beginning of period	76,593	9,633
Cash and cash equivalents at end of period	77,919	125,496
Supplemental disclosure 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		846
	1,355	47,487
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 33	$ 28