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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Class Of Stock Disclosures [Abstract]  
Schedule of Common Stock Reserved for Future Issuance

The following common stock is reserved for future issuance at December 31, 2018 and 2017 :

 

 

 

As of December 31,

 

 

 

2018

 

 

2017

 

Warrants issued and outstanding

 

 

51,003

 

 

 

51,003

 

Stock option awards issued and outstanding

 

 

1,407,049

 

 

 

1,203,627

 

Authorized for grants under the 2016 Equity Incentive Plan

 

 

463,491

 

 

 

633,052

 

Authorized for grants under the 2016 Employee Stock

   Purchase Plan

 

 

100,000

 

 

 

100,000

 

 

 

 

2,021,543

 

 

 

1,987,682

 

(1)

Treasury stock in the amount of 357,314 and 135,000 as of December 31, 2018 and 2017, respectively, are excluded from the table above.