LEASES - Lease Term and Discount Rate (Details)	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term, operating leases	4 years 6 months	4 years 9 months 18 days
Weighted-average remaining lease term, finance leases	2 years 6 months	2 years 7 months 6 days
Weighted-average discount rate, operating leases	8.80%	8.50%
Weighted-average discount rate, financing leases	12.50%	11.20%