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CAPITAL STOCK - EXERCISE PRICE (Details)
9 Months Ended
Sep. 30, 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 September 30, 2018 | shares 92,535
Weighted Average Remaining Contractual Life in Years 1 year 10 months 20 days
Weighted Average Exercise Price $ 5.378
Number of Options Exercisable at September 30, 2018 | shares 92,535
Weighted Average Exercise Price $ 5.378
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 September 30, 2018 | shares 148,004
Weighted Average Remaining Contractual Life in Years 4 years 10 months 5 days
Weighted Average Exercise Price $ 7.764
Number of Options Exercisable at September 30, 2018 | shares 148,004
Weighted Average Exercise Price $ 7.764
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 September 30, 2018 | shares 112,428
Weighted Average Remaining Contractual Life in Years 6 years 3 months 28 days
Weighted Average Exercise Price $ 23.164
Number of Options Exercisable at September 30, 2018 | shares 105,533
Weighted Average Exercise Price $ 23.242
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 September 30, 2018 | shares 194,733
Weighted Average Remaining Contractual Life in Years 8 years 8 months 13 days
Weighted Average Exercise Price $ 59.852
Number of Options Exercisable at September 30, 2018 | shares 37,735
Weighted Average Exercise Price $ 39.898
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 September 30, 2018 | shares 117,045
Weighted Average Remaining Contractual Life in Years 8 years 7 months 15 days
Weighted Average Exercise Price $ 84.874
Number of Options Exercisable at September 30, 2018 | shares 30,211
Weighted Average Exercise Price $ 80.036
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 September 30, 2018 | shares 664,745
Weighted Average Remaining Contractual Life in Years 6 years 5 months 24 days
Weighted Average Exercise Price $ 38.873
Number of Options Exercisable at September 30, 2018 | shares 414,018
Weighted Average Exercise Price $ 19.378
Exercise price range, lower (in dollars per share) 4.40
Exercise price range, upper (in dollars per share) $ 108.25