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Prepayments and Other Current Assets
6 Months Ended
Jun. 30, 2020
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 June 30, 2020 and December 31, 2019:


   June 30,   December 31, 
   2020   2019 
Prepaid land lease  $169,504   $301,023 
Prepayment for purchase of materials   60,510    5,394,297 
Value-added tax recoverable   5,408,783    5,666,975 
Others   235,845    250,946 
   $5,874,642   $11,613,241