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Common Stock (Tables)
12 Months Ended
Dec. 31, 2018
Federal Home Loan Banks [Abstract]  
Summary of Common Stock Reserved for Future Issuance

At December 31, 2018 and 2017, the Company has reserved the following shares of common stock for future issuance:

 

     December 31,  
     2018      2017  

Shares reserved for Series Seed Preferred Stock outstanding

     —          806,711  

Shares reserved for Series A Preferred Stock outstanding

     —          7,611,438  

Shares reserved for vesting of restricted stock awards

     153,276        276,301  

Shares reserved for exercise of outstanding stock options

     2,164,101        1,034,961  

Shares reserved for issuance under the 2015 Stock Option and Grant Plan

     —          143,717  

Shares reserved for issuance under the 2018 Stock Option and Grant Plan

     385,561        —    

Shares reserved for issuance under the 2018 Employee Stock Purchase Plan

     223,200        —    
  

 

 

    

 

 

 

Total shares of authorized common stock reserved for future issuance

     2,926,138        9,873,128