CAPITAL STOCK- SUMMARY OF INFORMATION BY EXERCISE PRICE RANGE (Details)	12 Months Ended
	Dec. 31, 2015 $ / 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 December 31, 2015 | shares	225,302
Weighted Average Remaining Contractual Life in Years	4 years 10 months 24 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 5.600
Number of Options Exercisable at December 31, 2015 | shares	222,671
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 5.593
Exercise price, lower range limit	4.40
Exercise price, upper range limit	$ 6.90
$ 6.91 - $ 8.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2015 | shares	188,524
Weighted Average Remaining Contractual Life in Years	7 years 9 months 42 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 7.384
Number of Options Exercisable at December 31, 2015 | shares	96,689
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 7.383
Exercise price, lower range limit	6.91
Exercise price, upper range limit	$ 8.26
$ 8.27 - $11.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2015 | shares	168,496
Weighted Average Remaining Contractual Life in Years	6 years 9 months 5 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 9.079
Number of Options Exercisable at December 31, 2015 | shares	136,800
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 9.178
Exercise price, lower range limit	8.27
Exercise price, upper range limit	$ 11.65
$11.66 - $18.30
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2015 | shares	205,826
Weighted Average Remaining Contractual Life in Years	5 years 5 months 1 day
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 17.483
Number of Options Exercisable at December 31, 2015 | shares	132,229
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 17.206
Exercise price, lower range limit	11.66
Exercise price, upper range limit	$ 18.30
$18.31 - $39.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2015 | shares	152,462
Weighted Average Remaining Contractual Life in Years	9 years 6 months 5 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 36.336
Number of Options Exercisable at December 31, 2015 | shares	33,170
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 26.916
Exercise price, lower range limit	18.31
Exercise price, upper range limit	$ 39.76
$ 4.40 - $39.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2015 | shares	940,610
Weighted Average Remaining Contractual Life in Years	6 years 8 months 7 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 14.163
Number of Options Exercisable at December 31, 2015 | shares	621,559
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 10.269
Exercise price, lower range limit	4.40
Exercise price, upper range limit	$ 39.76