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CAPITAL STOCK - EXERCISE PRICE (Details)
3 Months Ended
Mar. 31, 2017
$ / 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, 2017 | shares 115,744
Weighted Average Remaining Contractual Life in Years 3 years 6 months 21 days
Weighted Average Exercise Price $ 5.599
Number of Options Exercisable at March 31, 2017 | shares 115,019
Weighted Average Exercise Price $ 5.595
Exercise price range, lower (in dollars per share) 4.40
Exercise price range, upper (in dollars per share) $ 6.90
$ 6.91 - $ 8.34  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2017 | shares 158,542
Weighted Average Remaining Contractual Life in Years 6 years 6 months 28 days
Weighted Average Exercise Price $ 7.451
Number of Options Exercisable at March 31, 2017 | shares 127,207
Weighted Average Exercise Price $ 7.471
Exercise price range, lower (in dollars per share) 6.91
Exercise price range, upper (in dollars per share) $ 8.34
$ 8.35 - $18.13  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2017 | shares 190,798
Weighted Average Remaining Contractual Life in Years 6 years 6 months 1 day
Weighted Average Exercise Price $ 13.142
Number of Options Exercisable at March 31, 2017 | shares 147,027
Weighted Average Exercise Price $ 11.752
Exercise price range, lower (in dollars per share) 8.35
Exercise price range, upper (in dollars per share) $ 18.13
$18.14 - $39.76  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2017 | shares 178,530
Weighted Average Remaining Contractual Life in Years 7 years 8 months 1 day
Weighted Average Exercise Price $ 34.903
Number of Options Exercisable at March 31, 2017 | shares 95,695
Weighted Average Exercise Price $ 31.424
Exercise price range, lower (in dollars per share) 18.14
Exercise price range, upper (in dollars per share) $ 39.76
$39.77 - $81.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2017 | shares 110,707
Weighted Average Remaining Contractual Life in Years 9 years 9 months 1 day
Weighted Average Exercise Price $ 72.748
Number of Options Exercisable at March 31, 2017 | shares 6,849
Weighted Average Exercise Price $ 72.713
Exercise price range, lower (in dollars per share) 39.77
Exercise price range, upper (in dollars per share) $ 81.00
$ 4.40 - $81.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding at March 31, 2017 | shares 754,321
Weighted Average Remaining Contractual Life in Years 6 years 9 months 25 days
Weighted Average Exercise Price $ 24.687
Number of Options Exercisable at March 31, 2017 | shares 491,797
Weighted Average Exercise Price $ 13.882
Exercise price range, lower (in dollars per share) 4.40
Exercise price range, upper (in dollars per share) $ 81.00