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REVENUE
 12 Months Ended
Dec. 31, 2018
Revenue [abstract]  
REVENUE
17. REVENUE
Revenue includes the following components:
 
For the Years Ended December 31,
 
2018
 
2017
Revenue - Streaming Agreement
 
 
 
Cash payment proceeds
$
6,036

 
$
6,138

Deferred revenue recognized
13,738

 
14,156

 
19,774

 
20,294

Revenue - Spot sales
253,243

 
295,203

Total revenue
$
273,017

 
$
315,497