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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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