INVESTMENT TAX CREDITS (Details) - Canadian Federal $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
INVESTMENT TAX CREDITS
Non-refundable ITCs related to scientific research and development expenditures	$ 3,907
2030
INVESTMENT TAX CREDITS
Non-refundable ITCs related to scientific research and development expenditures	764
2031
INVESTMENT TAX CREDITS
Non-refundable ITCs related to scientific research and development expenditures	1,000
2032
INVESTMENT TAX CREDITS
Non-refundable ITCs related to scientific research and development expenditures	1,125
2033
INVESTMENT TAX CREDITS
Non-refundable ITCs related to scientific research and development expenditures	$ 1,018