RELATED PARTY TRANSACTIONS - Summary of Other Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fairweather Science L L C
Related Party Transaction [Line Items]
Related party transaction expense	$ 2		$ 5	$ 31
Inupiate Resources Leasing L L C
Related Party Transaction [Line Items]
Related party transaction expense		$ 92	150	230
Inupiate Resources L L C
Related Party Transaction [Line Items]
Related party transaction expense	214	105	418	308
Summit Air Resources
Related Party Transaction [Line Items]
Related party transaction expense	2		37	32
1856125 Alberta Ltd.
Related Party Transaction [Line Items]
Related party transaction expense	$ 3	$ 4	$ 84	$ 91