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General - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Mar. 05, 2014
Sep. 30, 2014
Subsidiary
Derivative
Mar. 13, 2014
Dec. 31, 2013
Derivative
Sep. 30, 2013
Derivative
Dec. 31, 2012
Sep. 30, 2014
Foreign Exchange Forward Contract Derivatives [Member]
Sep. 30, 2014
Foreign Currency Forward Contracts [Member]
Sep. 30, 2014
Foreign Currency Forward Contracts [Member]
Mar. 05, 2014
IPO [Member]
Accounting Policies and General Information [Line Items]                    
Date of incorporation of the Company   Nov. 03, 2004                
Date of commencement of operations   Jan. 01, 2005                
Number of subsidiaries   5                
Stockholders' equity (deficiency)   $ 93,146   $ (43,008)   $ (37,448)        
Common stock shares sold to public   24,564,444   3,953,314           5,300,436
Common stock shares pursuant to the full exercise of an over-allotment option granted to the underwriters                   500,436
Aggregate net proceeds received 106,071                  
Convertible preferred stock converted into common stock 15,082,141                  
Convertible preferred stock converted into warrants to purchase common stock 122,572                  
Warrants exercised in net share settlement, shares issued     107,217              
Forward foreign exchange contracts maturity period             12 months      
Loss on derivative instruments               $ 167 $ 149  
Derivative instruments       0 0