Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of Assets Measured at Fair Value on Recurring Basis

The Company’s financial instruments that are measured at fair value on a recurring basis consist of certificates of deposit. The following table summarizes the assets measured at fair value on a recurring basis as of September 30, 2021, and December 31, 2020, by level within the fair value hierarchy:

 

   September 30, 2021 
   (Level 1)   (Level 2)   (Level 3)   Total 
Marketable investment securities:                    
Certificates of deposit  $-   $1,251,285   $-   $1,251,285 

 

 

   December 31, 2020 
   (Level 1)   (Level 2)   (Level 3)   Total 
Marketable investment securities:                    
Certificates of deposit  $-   $4,335,446   $-   $4,335,446