XML 31 R20.htm IDEA: XBRL DOCUMENT v3.21.2
Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of rent expense
                    
                 
    Three Months Ended September 30    Nine Months Ended September 30 
    2021    2020    2021    2020 
Rent expense  $22,397   $18,231   $53,887   $54,465