Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (8,074)	$ (4,791)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	254	162
Stock-based compensation	646	194
Amortization of deferred charges related to long-term loan	31	58
Revaluation of fair value of warrants to convertible preferred stock		368
Changes in assets and liabilities:
Trade receivables	14,014	10,171
Prepaid expenses and other current assets	(284)
Trade payables	(74)	(356)
Accrued expenses and other liabilities	(1,069)	(1,458)
Increase in severance pay, net	314	5
Deferred revenues	(1,424)	(1,072)
Other long term liabilities	3	26
Net cash provided by operating activities	4,337	3,307
Cash flows from investing activities:
Decrease in short-term deposit	3,987
Decrease (increase) in long-term deposits	37	(33)
Increase in restricted cash	(15)	(51)
Purchase of property and equipment	(608)	(230)
Net cash provided by (used in) investing activities	3,401	(314)
Cash flows from financing activities:
Exercise of employee stock options	13	11
Payment of deferred equity offering cost	(335)
Net proceeds from initial public offering	108,447
Net cash provided by financing activities	108,125	11
Increase in cash and cash equivalents	115,863	3,004
Cash and cash equivalents at beginning of period	9,633	14,470
Cash and cash equivalents at end of period	125,496	17,474
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 offering costs not yet paid	846
Supplemental non-cash items	47,487
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 28	$ 90