SHARE-BASED COMPENSATION - Summary of Status and Changes of Unvested Restricted Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Non-vested Restricted Stock Awards
Number of Shares
Unvested, beginning balance (in shares)	4,000	22,000
Vested (in shares)	(4,000)	(18,000)
Unvested, ending balance (in shares)	0	4,000
Weighted-Average Grant Date Fair Value
Unvested beginning balance (in dollars per share)	$ 11.43	$ 11.43
Vested (in dollars per share)	$ 11.43	11.43
Unvested ending balance (in dollars per share)		$ 11.43
Non-vested Restricted Stock Units
Number of Shares
Unvested, beginning balance (in shares)	0	3,000
Vested (in shares)		(3,000)
Unvested, ending balance (in shares)		0
Weighted-Average Grant Date Fair Value
Unvested beginning balance (in dollars per share)		$ 4.09
Vested (in dollars per share)		$ 4.09