NOTES PAYABLE - Schedule of Debt and Debt Issuance Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt issuance costs and debt discount current portion	$ (125)	$ (1,131)
Net notes payable, current portion	2,571	4,733
Notes payable, net of current portion	24,489	108,675
Debt issuance costs and debt discount net of current portion	(347)	(2,041)
Notes payable, net of current portion	24,142	106,634
Total notes payable	27,185	114,539
Total debt issuance costs and debt discount	(472)	(3,172)
Total notes payable	$ 26,713	$ 111,367