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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Limited Partners' Capital Account [Line Items] |  |  |  |
Fair value of stock awards vested | $ 71,000 |  | $ 5,364,000 |
Unrecognized stock-based compensation, weighted average period (in years) |  |  | 2 years 9 months 18 days |
Stock Options |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | 11,000 | $ 0 | $ 11,000 | $ 0
Unrecognized stock-based compensation expense, stock options | 188,000 |  | 188,000 |
Aggregate intrinsic value of options exercised | 733,000 |  | 1,181,000 |
Restricted Stock, Restricted Stock Units And Performance Stock Units |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | 2,576,000 | 1,898,000 | 8,505,000 | 5,175,000
Restricted Stock |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 96,000 |  | $ 96,000 |
Restricted Stock | Non Employee Director |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period (in years) |  |  | 3 years |
Restricted Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 4,931,000 |  | $ 4,931,000 |
Performance Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 8,137,000 |  | $ 8,137,000 |
Weighted average | Restricted Stock |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period (in years) |  |  | 2 years 1 month 6 days |
Weighted average | Restricted Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period (in years) |  |  | 1 year 10 months 24 days |
Weighted average | Performance Stock Unit |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Unrecognized stock-based compensation, weighted average period (in years) |  |  | 1 year 9 months 18 days |
2016 Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options granted, term (in years) |  |  | 10 years |
2016 Plan | Minimum |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period (in years) |  |  | 1 year |
2016 Plan | Maximum |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Options, vesting period (in years) |  |  | 4 years |
Amended and Restated 1997 Employee Stock Purchase Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Stock-based compensation expense | $ 67,000 | $ 67,000 | $ 196,000 | $ 171,000
Class A Common Stock | 2016 Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Common stock, authorized shares (in shares) | 2,250,000 |  | 2,250,000 |
Number of shares available for future grant (in shares) | 932,000 |  | 932,000 |
Class A Common Stock | 2006 Incentive Plan |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Common stock, additional authorized shares (in shares) |  |  | 2,723,000 |

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