The maximum amount of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares authorized for issuance under share-based payment arrangement.

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Number of options vested.

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Per share or per unit amount of equity securities issued.

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STOCKHOLDERS' EQUITY - Additional Information (Details)								12 Months Ended
STOCKHOLDERS' EQUITY - Additional Information (Details)	Aug. 18, 2020 USD ($) $ / shares shares	Jun. 17, 2019 USD ($) shares	Jun. 12, 2019 USD ($) shares	Jun. 15, 2018 USD ($) $ / shares shares	Oct. 02, 2017 shares	Aug. 07, 2017 installment shares	Aug. 07, 2017 shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Jun. 11, 2020 USD ($)	Mar. 13, 2020 USD ($)	May 21, 2019 shares	Dec. 31, 2009 shares
STOCKHOLDERS' EQUITY
Stock repurchase , Authorized amount \| $										$ 2,400,000	$ 2,600,000
Net proceeds after associated fees and expenses \| $								$ 14,673,000	$ 0
Stock Repurchased During Period, Value \| $								$ 3,612,000	$ 5,515,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross					37,500			878,643	653,210
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares								637,270	847,030
Share-based Compensation, Total \| $								$ 2,294,000	$ 4,784,000
Share-based Compensation Arrangement by Share-based Payment Award Options exercised Number of Shares								1,032,922	15,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value \| $ / shares								$ 0.66	$ 1.26
Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Volume weighted average price \| $ / shares				$ 2.00
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								1,649,394	2,603,567
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition								24 days
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options \| $								$ 310,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								1,649,000	2,604,000
Stock options
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross								879,000	653,000
Employee [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross							470,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures							575,262
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares								$ 1.41
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition								1 month
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options \| $								$ 124,000
Number of Installments \| installment						3
Employee [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						33.00%
Employee [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						33.00%
Employee [Member] \| Share-based Compensation Award, Tranche Three [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage						33.00%
Non-Executive Directors \| Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								18,248	25,000
Non-Executive Directors \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								50.00%
Non-Executive Directors \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								0.00%
Common Class D [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares								54,896
Stock Repurchased During Period, Value \| $								$ 120,000
Repurchase Of Common Stock Price Per Share \| $ / shares								$ 2.19
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								8,250,000
Common Class D [Member] \| Stock Plan 2009 [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized													8,250,000
Common Class D [Member] \| Stock Vest Tax Repurchase [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares								710,992	957,895
Stock Repurchased During Period, Value \| $								$ 1,200,000	$ 1,900,000
Repurchase Of Common Stock Price Per Share \| $ / shares								$ 1.64	$ 1.96
Common Class D [Member] \| 2019 Equity and Performance Incentive Plan
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								520,425				5,500,000
Common Class D [Member] \| Chief Financial Officer [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares			211,838
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			94,150
Common Class D [Member] \| Chief Financial Officer [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						711,914
Common Class D [Member] \| Chief Financial Officer [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross			99,846
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			224,654			270,833
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures \| $			$ 243,750
Common Class D [Member] \| Chief Financial Officer [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche Three [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross			108,333
Common Class D [Member] \| Chief Financial Officer [Member] \| Stock options \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross						316,406
Common Class D [Member] \| Chief Financial Officer [Member] \| Stock options \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross						120,370
Common Class D [Member] \| Chief Administrative Officer [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					37,500
Common Class D [Member] \| Chairperson [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross			174,971
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			393,685			474,609
Common Class D [Member] \| Chairperson [Member] \| Stock options \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross						210,937
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						427,148
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Restricted stock awards [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						791,015
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Employees Stock Option [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross			291,619
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			656,142
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Stock options \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross						189,843
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Stock options \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross						351,562
Common Class D [Member] \| Non-Executive Directors \| Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		25,000		25,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures \| $		$ 50,000		$ 50,000
Common Class D [Member] \| David Kantor [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares			195,242
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			86,774
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares								3,208,288	1,709,315
Stock Repurchased During Period, Value \| $								$ 2,400,000	$ 3,500,000
Repurchase Of Common Stock Price Per Share \| $ / shares								$ 0.76	$ 2.06
Class A Common Stock [Member] \| Current ATM Program [Member]
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share) \| $ / shares	$ 0.001
Aggregate offering price \| $	$ 25,000,000
Number of shares issued during period	2,859,276
Volume weighted average price \| $ / shares	$ 5.39
Net proceeds after associated fees and expenses \| $	$ 14,700,000