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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jan. 31, 2016
Dec. 31, 2015
Jan. 31, 2015
Property Plant And Equipment [Line Items]      
Total property and equipment, gross $ 207,399 $ 113,053  
Less: accumulated depreciation (86,907) (54,607)  
Total property and equipment, net 120,492 58,446 $ 58,446
Servers      
Property Plant And Equipment [Line Items]      
Total property and equipment, gross 111,015 81,068  
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Total property and equipment, gross 70,106 13,400  
Computer hardware and software      
Property Plant And Equipment [Line Items]      
Total property and equipment, gross 11,009 8,724  
Furniture and fixtures      
Property Plant And Equipment [Line Items]      
Total property and equipment, gross 10,461 5,046  
Construction in progress      
Property Plant And Equipment [Line Items]      
Total property and equipment, gross $ 4,808 $ 4,815