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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares |  |  |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 17, 2016 | Mar. 09, 2016 | Dec. 08, 2015 | Aug. 03, 2015 | Nov. 01, 2010 | Dec. 31, 2016 | Nov. 30, 2010 | Sep. 30, 2017 | Aug. 17, 2016 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) | $ 8.55 |  |  |  |  |  |  |  | $ 11 |  |  | $ 8.55 |  |
Cor Advisors Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 1,395,000 |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 11.00 |  |  |  |  |
Common Stock | Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) |  |  |  |  |  |  |  | 70,690 |  |  |  |  |  |
Common Stock | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) |  |  |  |  |  |  |  | 70,690 |  |  |  | 6,134,988 |  |
TCW Shared Opportunity Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 240,000 |  | 240,000 |  |  | 240,000
Exercise price of warrants for non-voting common stock (in dollars per share) |  |  |  |  |  |  |  | $ 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 (in shares) |  |  |  |  |  |  |  |  | 960,000 |  |  |  | 480,000 |
Warrants exercised (in shares) | 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 90,000 |
Issuance of shares of voting common stock (in shares) | 52,284 |  |  |  |  |  |  |  |  |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
President And Chief Executive Officer | Cor Advisors Llc | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Four |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Five |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Six |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Seven |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
President And Chief Executive Officer | Cor Advisors Llc | Tranche Eight |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
Vice President and Chief Lending Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) |  |  |  | $ 8.80 | $ 8.84 | $ 8.90 | $ 9.04 |  |  |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | 0 |  |  |  |  |  |  |  | 435,000 |  |  | 0 |  |
Issuance of shares of voting common stock (in shares) |  |  |  | 40,081 | 70,775 | 53,711 | 37,355 |  |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  | 80,000 | 130,000 | 130,000 | 95,000 |  |  |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 95,000 |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 130,000 |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 130,000 |  |  |  |  |
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Four |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |
Brother of President and Chief Executive Officer | Cor Advisors Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 480,000 |
Warrants exercised (in shares) | 40,000 | 130,000 | 130,000 | 50,000 |  |  |  |  |  | 130,000 |  |  |  |
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |
Brother of President and Chief Executive Officer | Common Stock | Class B Common Stock | Cor Advisors Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) | 23,237 | 77,376 | 75,875 |  |  |  |  |  |  |  |  |  |  |
Brother of President and Chief Executive Officer | Common Stock | Class A Common Stock | Cor Advisors Llc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) |  |  |  | 25,051 |  |  |  |  |  | 64,962 |  |  |  |

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