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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 |  |  |  |  |  |

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