LEASES - Lease Costs & Additional Lease Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 833	$ 2,500
Variable lease cost	0	0
Sublease income	(975)	(2,233)
Lease income	$ 142
Lease cost		$ 267
Weighted-average remaining lease term - operating leases (in years)	1 year 10 months 24 days	1 year 10 months 24 days
Weighted-average discount rate - operating leases (as a percent)	4.13%	4.13%