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CAPITAL STOCK - EXERCISE PRICE (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
$ 4.40 - $ 6.90  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 94,451
Weighted Average Remaining Contractual Life in Years 2 years 4 months 24 days
Weighted Average Exercise Price $ 5.382
Number of Options Exercisable at March 31, 2018 | shares 94,451
Weighted Average Exercise Price $ 5.382
Exercise price range, lower (in dollars per share) 4.40
Exercise price range, upper (in dollars per share) $ 6.90
$ 6.91 - $ 8.55  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 168,628
Weighted Average Remaining Contractual Life in Years 5 years 1 month 24 days
Weighted Average Exercise Price $ 7.759
Number of Options Exercisable at March 31, 2018 | shares 168,628
Weighted Average Exercise Price $ 7.759
Exercise price range, lower (in dollars per share) 6.91
Exercise price range, upper (in dollars per share) $ 8.55
$ 8.56 - $39.56  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 143,957
Weighted Average Remaining Contractual Life in Years 6 years 6 months 24 days
Weighted Average Exercise Price $ 22.445
Number of Options Exercisable at March 31, 2018 | shares 125,721
Weighted Average Exercise Price $ 22.747
Exercise price range, lower (in dollars per share) 8.56
Exercise price range, upper (in dollars per share) $ 39.56
$39.57 - $69.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 215,217
Weighted Average Remaining Contractual Life in Years 8 years 10 months 24 days
Weighted Average Exercise Price $ 57.940
Number of Options Exercisable at March 31, 2018 | shares 47,469
Weighted Average Exercise Price $ 39.840
Exercise price range, lower (in dollars per share) 39.57
Exercise price range, upper (in dollars per share) $ 69.77
$69.78 - $108.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 113,205
Weighted Average Remaining Contractual Life in Years 8 years 6 months 24 days
Weighted Average Exercise Price $ 79.042
Number of Options Exercisable at March 31, 2018 | shares 34,448
Weighted Average Exercise Price $ 76.947
Exercise price range, lower (in dollars per share) 69.78
Exercise price range, upper (in dollars per share) $ 108.25
$ 4.40 - $108.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2018 | shares 735,458
Weighted Average Remaining Contractual Life in Years 6 years 8 months 24 days
Weighted Average Exercise Price $ 35.985
Number of Options Exercisable at March 31, 2018 | shares 470,717
Weighted Average Exercise Price $ 19.584
Exercise price range, lower (in dollars per share) 4.40
Exercise price range, upper (in dollars per share) $ 108.25