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Accounts Receivable - Third Parties
 3 Months Ended
Mar. 31, 2019
Accounts Receivable, Net [Abstract]  
Accounts Receivable - Third Parties
Accounts Receivable—Third Parties
Accounts receivable—third parties consist of the following:
 
 
March 31,
2019
 
December 31,
2018
Trade customers
 
$
14,455

 
$
17,325

Allowance for doubtful accounts
 
(728
)
 
(921
)
 
 
13,727

 
16,404

Other
 
1,768

 
—

Accounts receivable, net—third parties
 
$
15,495

 
$
16,404