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Short Term Investments
12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Short Term Investments
8. SHORT-TERM INVESTMENTS
 
 
 
 
December 31, 2017
 
December 31, 2016
Available for Sale
 
Fair
Value
 
Cost
 
Accumulated
unrealized
holding gains
 
Fair Value
 
Cost
 
Accumulated
unrealized
holding gains
Short-term investments
 
$
51,590

 
$
49,985

 
$
1,605

 
$
36,729

 
$
36,295

 
$
434