STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($)					3 Months Ended			12 Months Ended
	Oct. 29, 2021	Jun. 23, 2021	Jan. 19, 2021	Jun. 12, 2019	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 07, 2022	Dec. 31, 2021	May 17, 2021	Jan. 27, 2021	Aug. 18, 2020	May 21, 2019	Jun. 02, 2015	Dec. 31, 2009
STOCKHOLDERS' EQUITY
Number of shares issued during period							$ 12,125,000
Stock repurchase , Authorized amount remaining					$ 25,000,000
Net proceeds after associated fees and expenses					0		12,125,000
Stock Repurchased During Period, Value					$ 10,000		$ 872,000
Stock options to purchase common stock							20,000
Number of restricted shares					16,795		832,847
Share-based Compensation, Total					$ 124,000		$ 253,000
Share-based Compensation Arrangement by Share-based Payment Award Options exercised Number of Shares					0		0
Restricted stock awards [Member]
STOCKHOLDERS' EQUITY
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options					$ 378,000
Other than options, granted					6,887		20,000
Stock options
STOCKHOLDERS' EQUITY
Stock options to purchase common stock					6,887
Number of Options, Vested and expected to vest					3,777,000
Employee [Member]
STOCKHOLDERS' EQUITY
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 1.45
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Stock Options					$ 19,000
Employee [Member] | Maximum
STOCKHOLDERS' EQUITY
Employee Service Share-based Compensation, Non-vested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition					3 months
Class A And Class D Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock repurchase , Authorized amount									$ 25,000,000
Common Class D [Member]
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)											$ 0.001
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized															8,250,000
Common Class D [Member] | Open Market Sale Agreement [Member]
STOCKHOLDERS' EQUITY
Shares issued and sold					0
Common Class D [Member] | Scenario, Plan [Member] | Open Market Sale Agreement [Member] | Maximum
STOCKHOLDERS' EQUITY
Aggregate offering price											$ 25,000,000.0
Common Class D [Member] | Employees Stock Option [Member]
STOCKHOLDERS' EQUITY
Stock options to purchase common stock				94,150
Other than options, granted				211,838
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					2,649		495,296
Stock Repurchased During Period, Value					$ 10,000		$ 872,000
Repurchase Of Common Stock Price Per Share					$ 3.63		$ 1.76
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					5,884,252									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 Two [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 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
Stock options to purchase common stock				108,333
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 options to purchase shares				189,843
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY
Stock Repurchased During Period, Shares					0		0
Shares converted	883,890
Class A Common Stock [Member] | Current ATM Program
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)													$ 0.001
Aggregate offering price												$ 25,000,000.0	$ 25,000,000
Number of shares issued during period						$ 21,200,000		$ 2,859,276
Volume weighted average price								$ 5.39
Net proceeds after associated fees and expenses			$ 24,000,000.0				$ 2,800,000	$ 14,700,000
Shares issued and sold			4,325,102			1,893,126	420,439
Number of additional shares issued and sold			1,465,825
Gross proceeds			$ 25,000,000.0			$ 22,000,000.0	$ 3,000,000.0
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					2,000,000
Additional shares authorized		2,000,000
Common Stock Class B
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)					$ 0.001					$ 0.001
Common stock, shares issued					2,861,843					2,861,843
Common Stock Class C
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)					$ 0.001					$ 0.001
Shares converted	883,890
Common stock, shares issued					2,045,016					2,045,016