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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (19,067) $ (8,991)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 858 566
Stock-based compensation 2,838 1,126
Capital loss from disposal of fixed assets   (5)
Amortization of deferred charges related to loan 93 162
Revaluation of fair value of warrants to convertible preferred stock   1,508
Changes in assets and liabilities:    
Trade receivables 7,122 5,881
Prepaid expenses and other current assets (232) 463
Other long term assets (615)  
Trade payables 591 (384)
Accrued expenses and other liabilities 2,696 263
Increase in severance pay, net 344 57
Deferred revenues 297 183
Other long term liabilities 431 (47)
Net cash provided by (used in) operating activities (4,644) 782
Cash flows from investing activities:    
Decrease (increase) in short-term deposit 4,242 (1)
Decrease (increase) in long-term deposits 48 (30)
Decrease (increase) in restricted cash 218 (332)
Purchase of property and equipment (1,739) (828)
Net cash provided by (used in) investing activities 2,769 (1,191)
Cash flows from financing activities:    
Exercise of employee stock options 213 56
Exercise of warrants to purchase Series D convertible preferred stock   1,137
Payment of deferred equity offering cost (1,181)  
Net proceeds from initial public offering 108,447  
Net cash provided by financing activities 107,479 1,193
Increase in cash and cash equivalents 105,604 784
Cash and cash equivalents at beginning of period 9,633 14,470
Cash and cash equivalents at end of period 115,237 15,254
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 charges related to warrants granted to credit facilitator   263
Exercise of warrants to purchase Series D convertible preferred stock   4,679
Supplemental non-cash items 46,641 4,942
Supplemental disclosures of cash flow information:    
Cash paid for income taxes $ 103 $ 187