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RELATED-PARTY TRANSACTIONS - Transactions with TWC Shared Opportunity Fund V, L.P., a Greater than 5 percent Shareholder (Details) - $ / shares		12 Months Ended
	Nov. 01, 2010	Dec. 31, 2018	Aug. 03, 2015
Related Party Transaction [Line Items]
Issuance of shares of voting common stock (in shares)		6,134,988
Exercise price of warrants for non-voting common stock (in dollars per share)	$ 11.00
Tcw Shared Opportunity Fund
Related Party Transaction [Line Items]
Warrant exercisable period	5 years
Warrants issued (in shares)	240,000
Exercise price of warrants for non-voting common stock (in dollars per share)	$ 11.00		$ 9.13

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