STOCKHOLDERS' EQUITY - Additional Information (Details)							1 Months Ended		3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 27, 2022 USD ($) shares	Jul. 05, 2022 USD ($) director shares	Oct. 29, 2021 shares	Jul. 06, 2021 USD ($) director shares	Jun. 23, 2021 shares	Jun. 12, 2019 shares	Nov. 04, 2022 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Mar. 07, 2022 USD ($)	Dec. 31, 2021 $ / shares shares	May 17, 2021 USD ($) $ / shares	Aug. 31, 2020 $ / shares	May 21, 2019 shares	Jun. 02, 2015 shares	Dec. 31, 2009 shares
STOCKHOLDERS' EQUITY
Number of shares issued during period | $														$ 33,277,000
Net proceeds after associated fees and expenses | $													$ 0	33,277,000
Stock Repurchased During Period, Value | $													26,486,000	944,000
Share-based Compensation, Total | $									$ 5,000,000.0	$ 53,000			$ 5,469,000	$ 478,000
Stock options
STOCKHOLDERS' EQUITY
Stock options to purchase common stock									877,174	0			884,061	20,000
Number of options vested in period									422,385	70,796			439,180	903,643
Share-based Compensation Arrangement by Share-based Payment Award Options exercised Number of Shares									0	22,500			60,240	219,756
Number of Options, Vested and expected to vest									4,541,393				4,541,393
Employee [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares													$ 1.67
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition													19 months
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $									$ 1,300,000				$ 1,300,000
Class A And Class D Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock repurchase , Authorized amount | $																$ 25,000,000
Stock Repurchased During Period, Shares									0				0
Class A And Class D Common Stock [Member] | Maximum
STOCKHOLDERS' EQUITY
Stock repurchase , Authorized amount | $	$ 500,000
Common Class D [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares									100,803	6,715			4,766,392	6,715
Stock Repurchased During Period, Value | $									$ 439,000	$ 39,000			$ 25,000,000.0	$ 39,000
Repurchase Of Common Stock Price Per Share | $ / shares									$ 4.35	$ 5.80			$ 5.25	$ 5.80
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																					8,250,000
Common Class D [Member] | Subsequent events
STOCKHOLDERS' EQUITY
Stock repurchase , Authorized amount remaining | $							$ 443,000
Stock Repurchased During Period, Shares							13,577
Stock Repurchased During Period, Value | $							$ 57,000
Repurchase Of Common Stock Price Per Share | $ / shares							$ 4.23
Common Class D [Member] | Open Market Sales Agreement
STOCKHOLDERS' EQUITY
Shares issued and sold													0
Common Class D [Member] | Class D Sale Agreement
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share) | $ / shares																		$ 0.001
Common Class D [Member] | Scenario, Plan [Member] | Class D Sale Agreement | Maximum
STOCKHOLDERS' EQUITY
Aggregate offering price | $																		$ 25,000,000.0
Common Class D [Member] | Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition													17 months
Other than options, granted									1,302,928	38,684			1,357,687	101,057
Total unrecognized compensation, other than options | $									$ 1,800,000				$ 1,800,000
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									325,872	3,285			344,702	512,632
Stock Repurchased During Period, Value | $									$ 1,400,000	$ 18,000			$ 1,500,000	$ 922,000
Repurchase Of Common Stock Price Per Share | $ / shares									$ 4.23	$ 5.38			$ 4.29	$ 1.80
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									3,656,278				3,656,278							5,500,000
Additional shares authorized					5,519,575
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	115,248
Common Class D [Member] | Chief Financial Officer [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	150,000
Common Class D [Member] | Chief Financial Officer [Member] | Restricted stock awards [Member] | Share-based Compensation Award, Tranche Three [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 One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	58,036
Common Class D [Member] | Chief Financial Officer [Member] | Employees Stock Option [Member] | Share-based Compensation Award, Tranche Three [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock						108,333
Common Class D [Member] | Chief Administrative 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	39,007
Common Class D [Member] | Chief Administrative Officer [Member] | Employees Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	19,643
Common Class D [Member] | Employee [Member] | Long Term Incentive Plan | Restricted stock awards [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	195,032
Common Class D [Member] | Employee [Member] | Long Term Incentive Plan | Employees Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	208,298
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	336,602
Common Class D [Member] | Chief Executive Officer and President [Member] | Restricted stock awards [Member] | Share-based Compensation Award, Tranche Three [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock						316,406
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						711,914
Common Class D [Member] | Chief Executive Officer and President [Member] | Employees Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	169,503
Common Class D [Member] | Four Non-Executive Directors [Member] | Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Stock issued during period, value, restricted stock award fair value | $		$ 50,000		$ 50,000
Number of non-executive directors, received awards | director		4		4
Vesting period		2 years		2 years
Restricted stock issued		11,848		9,671
Common Class D [Member] | Cathy Hughes [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	201,961
Common Class D [Member] | Cathy Hughes [Member] | Restricted stock awards [Member] | Share-based Compensation Award, Tranche Three [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 One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	101,702
Common Class D [Member] | Cathy Hughes [Member] | Employees Stock Option [Member] | Share-based Compensation Award, Tranche Three [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock						189,843
Common Class D [Member] | C.Kristopher Simpson | Restricted stock awards [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	23,936
Common Class D [Member] | C.Kristopher Simpson | Employees Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	12,054
Common Class D [Member] | Chief Executive Officer | Restricted stock awards [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	100,160
Common Class D [Member] | Chief Executive Officer | Restricted stock awards [Member] | Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures						211,838
Common Class D [Member] | Chief Executive Officer | Employees Stock Option [Member] | Share-based Compensation Award, Tranche One [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock	50,438
Common Class D [Member] | Chief Executive Officer | Employees Stock Option [Member] | Share-based Compensation Award, Tranche Two [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock						94,150
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares										0			0	0
Shares converted			883,890
Class A Common Stock [Member] | 2020 Open Market Sale Agreement
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share) | $ / shares																			$ 0.001
Number of shares issued during period | $															$ 2,859,276
Volume weighted average price | $ / shares															$ 5.39
Net proceeds after associated fees and expenses | $								$ 9,300,000							$ 14,700,000
Number of additional shares issued and sold								1,465,826
Class A Common Stock [Member] | 2021 Open Market Sale Agreement
STOCKHOLDERS' EQUITY
Net proceeds after associated fees and expenses | $											$ 21,200,000	$ 2,800,000
Shares issued and sold											1,893,126	420,439
Class A Common Stock [Member] | Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition													27 months
Other than options, granted									750,000				750,000	0
Average fair value at grant date (in dollars per share) | $ / shares									$ 5.39				$ 5.39
Other than options, vested In period													0
Other than options, cancelled in period									0				0
Other than options, unvested, number									750,000				750,000
Other than options, unvested, weighted average grant date fair value | $ / shares									$ 5.39				$ 5.39
Total unrecognized compensation, other than options | $									$ 4,000,000.0				$ 4,000,000.0
Class A Common Stock [Member] | 2019 Equity and Performance Incentive Plan
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant									1,250,000				1,250,000
Additional shares authorized					2,000,000
Class A Common Stock [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	468,750
Class A Common Stock [Member] | Cathy Hughes [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	281,250
Common Stock Class B
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share) | $ / shares									$ 0.001				$ 0.001				$ 0.001
Common stock, shares issued									2,861,843				2,861,843				2,861,843
Common Stock Class C
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share) | $ / shares									$ 0.001				$ 0.001				$ 0.001
Shares converted			883,890
Common stock, shares issued									2,045,016				2,045,016				2,045,016