LEASES - Assets Recorded Under Capital Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total cost of property and equipment under capital leases	$ 198	$ 475
Less: accumulated amortization	(92)	(256)
Property under capital leases, net	106	219
Vehicles
Property, Plant and Equipment [Line Items]
Total cost of property and equipment under capital leases	92	373
Office equipment
Property, Plant and Equipment [Line Items]
Total cost of property and equipment under capital leases	$ 106	$ 102