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ACCOUNTS RECEIVABLE
 3 Months Ended
Mar. 31, 2017
Accounts Receivable, Net [Abstract]  
ACCOUNTS RECEIVABLE
6.    ACCOUNTS RECEIVABLE
Accounts receivable comprised the following at March 31, 2017 and December 31, 2016:
 
March 31, 2017

 
December 31, 2016

Unrelated customers
$
157,728

 
$
187,937

Less: allowance for bad debts and credit notes
(8,583
)
 
(9,598
)
Total accounts receivable
$
149,145

 
$
178,339