ORGANIZATION AND BASIS OF PRESENTATION - IPO (Details) - Class A common stock - shares	1 Months Ended	9 Months Ended
	Apr. 30, 2014	Dec. 31, 2014
Organization and basis of presentation
Issuance of common stock (in shares)		7,483,442
IPO
Organization and basis of presentation
Issuance of common stock (in shares)	7,475,000