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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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