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Prepayments and other current assets
3 Months Ended
Mar. 31, 2021
Prepaid Expenses And Other Current Assets Disclosure [Abstract]  
Prepayments and other current assets

(5) Prepayments and other current assets


Prepayments and other current assets consisted of the following as of March 31, 2021 and December 31, 2020:


    March 31,    December 31, 
    2021    2020 
Prepaid land lease   $182,613    $183,912 
Prepayment for purchase of materials    4,003,350     10,945 
Value-added tax recoverable    6,067,438     5,864,989 
Others    402,138     991,669 
    $10,655,539    $7,051,515