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Stockholders' Equity and Redeemable Convertible Preferred Stock (Details 3) - $ / shares
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested at beginning  
Granted 164,113  
Vested (164,113)  
Nonvested at ending  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Nonvested at beginning
Granted 2.2  
Vested 2.2  
Nonvested at ending
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested at beginning  
Granted 118,512  
Vested  
Nonvested at ending 118,512  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Nonvested at beginning $ 2.20
Granted 2.20  
Vested  
Nonvested at ending $ 2.20