INCOME TAXES - Deferred Income Tax Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current deferred tax assets	$ 7	$ 460
Noncurrent deferred tax assets	5,361	3,725
Current deferred tax liabilities	0	(84)
Other long-term liabilities	(29)	(24)
Net deferred tax assets	$ 5,339	$ 4,077