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

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Percentage of vesting of award 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)						1 Months Ended	3 Months Ended		9 Months Ended
STOCKHOLDERS' EQUITY - Additional Information (Details)	Jun. 16, 2020 shares	Jun. 12, 2019 shares	Oct. 02, 2017 shares	Aug. 07, 2017 shares	Aug. 07, 2017 installment shares	Aug. 31, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Aug. 18, 2020 USD ($) $ / shares	Jun. 11, 2020 USD ($)	Mar. 13, 2020 USD ($)	May 21, 2019 shares	Dec. 31, 2009 shares
STOCKHOLDERS' EQUITY
Number of shares issued during period \| $									$ 14,772,000	$ 1,609,000
Stock Repurchase Program, Authorized Amount \| $							$ 2,600,000		2,600,000			$ 2,400,000	$ 2,600,000
Net proceeds after associated fees and expenses \| $									14,772,000	0
Stock Repurchased During Period, Value \| $									$ 3,607,000	$ 5,323,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross							0	653,210	708,732	653,210
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares							0	0	624,770	834,530
Share-based Compensation, Total \| $							$ 794,000	$ 1,900,000	$ 1,455,000	$ 2,592,000
Share-based Compensation Arrangement by Share-based Payment Award Options exercised Number of Shares							0	0	1,032,922	15,000
Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								1,499,723	1,649,394	2,379,962
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition									4 months
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options \| $							$ 1,000,000		$ 1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									1,649,000
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									$ 1.39
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition									3 months
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options \| $							$ 135,000		$ 135,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					470,000
Number of Installments \| installment					3
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%
Employee [Member] \| 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					33.00%
Common Class D [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares								448,742	3,208,288	1,709,315
Stock Repurchased During Period, Value \| $								$ 975,000	$ 2,400,000	$ 3,500,000
Repurchase Of Common Stock Price Per Share \| $ / shares								$ 2.17	$ 0.76	$ 2.06
Common Class D [Member] \| Employees Stock Option [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] \| 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							3,195	13,264	706,767	871,383
Stock Repurchased During Period, Value \| $							$ 6,000	$ 25,000	$ 1,200,000	$ 1,700,000
Repurchase Of Common Stock Price Per Share \| $ / shares							$ 1.74	$ 1.87	$ 1.64	$ 1.94
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							690,336		690,336					5,500,000
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
Common Class D [Member] \| Chief Financial Officer [Member] \| Employees Stock Option [Member] \| Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		243,750
Common Class D [Member] \| Chief Financial Officer [Member] \| Employees Stock Option [Member] \| 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
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights		108,333
Common Class D [Member] \| Chief Administrative Officer [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares		195,242	37,500
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] \| Employees Stock Option [Member] \| 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]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		86,774
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				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		351,562
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		656,142
Common Class D [Member] \| Chief Executive Officer and President [Member] \| Employees Stock Option [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross		316,406
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		711,914
Common Class D [Member] \| Non-Executive Directors \| Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	18,248									25,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures \| $									$ 50,000	$ 50,000
Common Class D [Member] \| Cathy Hughes [Member] \| Employees Stock Option [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] \| Cathy Hughes [Member] \| Employees Stock Option [Member] \| Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		189,843
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares								6,345		54,896
Stock Repurchased During Period, Value \| $								$ 14,000		$ 120,000
Repurchase Of Common Stock Price Per Share \| $ / shares								$ 2.20		$ 2.19
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 \| $						$ 14,800,000