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Stockholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity (Deficit)  
Summary of restricted stock activity

 

 

 

 

 

 

 

 

    

 

    

Weighted

 

 

 

 

 

Average Grant

 

 

 

Number

 

Date Fair Value

 

 

 

of Shares

 

Per Share

 

Unvested restricted common stock as of December 31, 2013

 
1,239,247

 

$
0.00001

 

Vested

 
(479,709)

 

$
0.00001

 

Unvested restricted common stock as of December 31, 2014

 
759,538

 

$
0.00001

 

Vested

 
(759,538)

 

$
0.00001

 

Unvested restricted common stock as of December 31, 2015

 

 —

 

$
0.00001