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Preferred Stock
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Temporary Equity Disclosure [Abstract]    
Preferred Stock
8. Preferred Stock and Common Stock
As of June 30, 2020, the Company had 10,000,000 shares of preferred stock authorized and none issued and outstanding.
Reserve for future issuance
The Company has reserved the following number of shares of common stock for future issuance upon the exercise of options, vesting of restricted stock units or grant of equity awards:
    
June 30,

2020
    
December 31,

2019
 
Options issued and outstanding
     2,140,012        2,562,800  
Unvested restricted stock units
     661,778        828,935  
Options available for future grants
     2,260,656        215,043  
Shares available for issuance under the 2018 ESPP
     920,030        555,583  
  
 
 
    
 
 
 
Total
     5,982,476        4,162,361  
  
 
 
    
 
 
 
8. Preferred Stock
As of December 31, 2019 and 2018, the Company had 10,000,000 shares of preferred stock authorized and none was issued and outstanding.