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Other (Loss) Income (Tables)
 6 Months Ended
Jun. 30, 2015
Other Income and Expenses [Abstract]  
Summary of Other (Loss) Income
     Three Months Ended June 30,      Six Months Ended June 30,  
     2015      2014      2015      2014  
     $      $      $      $  

TIL stock purchase warrants received

      —          —          —          6,839  

Volatile organic compound emission plant lease loss

      (14 )       (166 )       (54 )       (67 ) 

Impairment of marketable securities

      (683 )       —          (683 )       —    

Miscellaneous income (loss)

      308        (568 )       723        745  
  

 

 

     

 

 

     

 

 

     

 

 

  

Other (loss) income

      (389 )       (734 )       (14 )       7,517