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Summary of Significant Accounting Polices - Stock Split (Details)
May. 05, 2014
$ / shares
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Stock split      
Par value of common stock (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Common stock      
Stock split      
Stock split conversion ratio 1.4