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Stockholders' Equity - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2014
Class of Stock [Line Items]        
Share-based compensation expense $ 10,841 $ 10,050 $ 3,834  
Common stock, shares authorized 1,400,000,000 120,000,000    
Preferred stock, shares authorized 25,000,000      
Common stock, shares issued 112,563,354 44,180,939 33,082,948 3,301,887
Convertible preferred stock        
Class of Stock [Line Items]        
Temporary equity, shares authorized   21,165,473    
Secondary Offering        
Class of Stock [Line Items]        
Share-based compensation expense   $ 500