NOTES PAYABLE - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2020	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019
Debt Disclosure [Abstract]
Interest expense	$ 1,159	$ 4,418	$ 13,262
Amortization of deferred financing costs	$ 115	$ 400	$ 1,169
Interest payable, current				$ 1,200