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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 06, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 31, 2017 | Nov. 01, 2010
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (shares) |  |  | 0 | 0 |  |  | 260,000 |
Issuance of shares of common stock (in shares) |  | 145,702 |  |  |  |  |  |
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
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on March 31, 2018 |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) |  |  |  |  |  | $ 8.44 |  |
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on June 30, 2018 |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) |  |  |  |  | $ 8.38 |  |  |
Brother of President and Chief Executive Officer | Class A Common Stock | Cor Advisors Llc |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of stock shares (in shares) | 176,488 |  |  |  |  |  |  |
Brother of President and Chief Executive Officer | Class B Common Stock | Cor Advisors Llc |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares canceled (shares) | 176,488 |  |  |  |  |  |  |

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