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CAPITAL STOCK - EXERCISE PRICE (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
$ 4.96 - $ 7.36  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at September 30, 2019 | shares 90,852
Weighted Average Remaining Contractual Life in Years 3 years 4 months 17 days
Weighted Average Exercise Price $ 6.988
Number of Options Exercisable at September 30, 2019 | shares 90,852
Weighted Average Exercise Price $ 6.988
Exercise price range, lower (in dollars per share) 4.96
Exercise price range, upper (in dollars per share) $ 7.36
$ 7.37 - $ 32.21  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at September 30, 2019 | shares 78,374
Weighted Average Remaining Contractual Life in Years 4 years 6 months 18 days
Weighted Average Exercise Price $ 15.964
Number of Options Exercisable at September 30, 2019 | shares 78,374
Weighted Average Exercise Price $ 15.964
Exercise price range, lower (in dollars per share) 7.37
Exercise price range, upper (in dollars per share) $ 32.21
$ 32.22 - $ 62.50  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at September 30, 2019 | shares 57,533
Weighted Average Remaining Contractual Life in Years 6 years 3 months 22 days
Weighted Average Exercise Price $ 39.797
Number of Options Exercisable at September 30, 2019 | shares 51,945
Weighted Average Exercise Price $ 39.740
Exercise price range, lower (in dollars per share) 32.22
Exercise price range, upper (in dollars per share) $ 62.50
$ 62.51 - $ 69.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at September 30, 2019 | shares 130,000
Weighted Average Remaining Contractual Life in Years 8 years 5 months 5 days
Weighted Average Exercise Price $ 69.770
Number of Options Exercisable at September 30, 2019 | shares 43,337
Weighted Average Exercise Price $ 69.770
Exercise price range, lower (in dollars per share) 62.51
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 September 30, 2019 | shares 144,869
Weighted Average Remaining Contractual Life in Years 8 years 2 months 9 days
Weighted Average Exercise Price $ 82.494
Number of Options Exercisable at September 30, 2019 | shares 56,721
Weighted Average Exercise Price $ 83.719
Exercise price range, lower (in dollars per share) 69.78
Exercise price range, upper (in dollars per share) $ 108.25
$ 4.96 - $ 108.25  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at September 30, 2019 | shares 501,628
Weighted Average Remaining Contractual Life in Years 6 years 7 months 6 days
Weighted Average Exercise Price $ 50.230
Number of Options Exercisable at September 30, 2019 | shares 321,229
Weighted Average Exercise Price $ 36.493
Exercise price range, lower (in dollars per share) 4.96
Exercise price range, upper (in dollars per share) $ 108.25