RELATED-PARTY TRANSACTIONS - Executive Change in Control Bonus Plan (Details)	12 Months Ended
	Dec. 31, 2017
Related Party Transaction [Line Items]
Percentage of total purchase price used to calculate bonus pool	0.008
Mr. Webb, CEO
Related Party Transaction [Line Items]
Bonus allocation	66.67%
Mr. Perri, CFO
Related Party Transaction [Line Items]
Bonus allocation	33.33%