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Other Current and Other Non-Current Assets (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure Of Other Current And Noncurrent Assets [Abstract]  
Schedule of other current and other non-current assets
   As of December 31, 
   2021   2020 
Input VAT receivable  $125,981   $134,746 
Prepayments - office rental   807,172    952,616 
Prepayments - insurance   110,408    292,095 
Prepayments - others   92,234    51,920 
Uniforms   19,963    17,954 
Tools and supplies   81,343    135,553 
Deferred costs   38,880    
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Other current assets  $1,275,981   $1,584,884 
           
Deposits  $296,986   $361,275 
Deferred costs   48,600    
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Other non-current assets  $345,586   $361,275