CHIEF EEXECUTIVE OFFICER TRANSITION COSTS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Apr. 25, 2018
Retention bonus, amount											$ 2,000
Impact of modification of share-based payment award											$ 2,088
CEO transition costs	$ 851	$ 1,145	$ 1,906	$ 5,488	$ 3,058	$ 2,622	$ 1,530	$ 0	$ 9,390	$ 7,210
Accrued liabilities [Member]
CEO transition costs accruals	$ 4,406				1,972				$ 4,406	1,972
Other non-current liabilities [Member]
CEO transition costs accruals					$ 1,808					$ 1,808
Maximum [Member]
Retention bonus, percentage											150.00%