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Preferred Redeemable Convertible Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Preferred Redeemable Convertible Stock

The following table provides a rollforward of the preferred redeemable convertible stock during the year ended December 31, 2016:

 

 

 

Preferred

 

 

 

redeemable convertible stock

 

 

 

Shares

 

 

Amount

 

Balance at December 31, 2015

 

 

23,271,702

 

 

$

43,106,906

 

Effect of accretion to redemption value

 

 

—

 

 

 

1,356,707

 

Conversion of preferred redeemable convertible

   stock into common stock

 

 

(23,271,702

)

 

 

(44,463,613

)

Balance at December 31, 2016

 

 

—

 

 

$

—