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Short-term and Other Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Short-term and Other Investments [Abstract]  
Summary of investment in Midas Gold Shares

 

 

 

 

 

 

 

 

 

    

June 30, 2018

    

December 31, 2017

 

Fair value at beginning of period

 

$

3,746

 

$

4,994

 

Gain/(loss) during the period

 

 

2,028

 

 

(1,248)

 

Fair value at end of period

 

$

5,774

 

$

3,746

 

 

 

 

 

 

 

 

 

Midas Gold Shares held at the end of the period

 

 

7,802,615

 

 

7,802,615