LEASES - Lease Cost Components (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total lease cost	$ 335
Sublease Income	362
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	187
Interest income and other (expense) income, net
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 148