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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2016 | Dec. 08, 2015 | Aug. 03, 2015 | Nov. 01, 2010 | Nov. 30, 2010 | Mar. 31, 2016 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock |  |  |  | $ 11.00 |  | $ 8.90 |
Cor Advisors Llc |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 1,395,000 |  |  |
Exercise price of warrants for non-voting common stock |  |  |  | $ 11.00 |  |  |
Common Stock | Class B Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of shares of voting common stock |  |  | 70,690 |  |  |  |
Common Stock | Class A Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of shares of voting common stock |  |  | 70,690 |  |  | 5,881,766 |
Tcw Shared Opportunity Fund |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 240,000 | 240,000 |  | 240,000
Exercise price of warrants for non-voting common stock |  |  | $ 9.13 | $ 11.00 |  |  |
Warrant exercisable period |  |  |  | 5 years | 5 years |  |
President And Chief Executive Officer | Cor Advisors Llc |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 960,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on October 1, 2011 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on January 1, 2012 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on April 1, 2012 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on July 1, 2012 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on October 1, 2012 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on January 1, 2013 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on April 1, 2013 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Vested on July 1, 2013 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 50,000 |  |  |
Vice President and Chief Lending Officer |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock | $ 8.90 | $ 9.04 |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 435,000 |  | 210,000 |
Issuance of shares of voting common stock | 53,711 | 37,355 |  |  |  |  |
Warrants exercised | 130,000 | 95,000 |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Vested on October 1, 2011 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 80,000 |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Vested on January 1, 2011 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 95,000 |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Vested on April 1, 2011 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 130,000 |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Vested on July 1, 2011 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 130,000 |  |  |

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