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EQUITY-BASED INCENTIVE PLANS - Nonvested Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
RSAs |  |
Shares |  |
Number of nonvested shares outstanding, beginning | 517,569 |
Nonvested shares granted | 296,000 |
Nonvested shares vested | (62,501) |
Nonvested shares forfeited | 3,333 |
Number of nonvested shares outstanding, ending | 747,735 | 517,569
Weighted Average Grant Date Fair Value |  |
Weighted average exercise price outstanding, beginning (in usd per share) | $ 4.74 |
Weighted average exercise price outstanding, nonvested options granted (in usd per share) | 3.62 |
Weighted average exercise price outstanding, options vested (in usd per share) | 5.21 |
Weighted average exercise price outstanding, options forfeited (in usd per share) | 5.54 |
Weighted average exercise price outstanding, ending (in usd per share) | $ 4.25 | $ 4.74
Unrecognized stock-based compensation expense | $ 2,451 |
Weighted average remaining vesting period | 2 years 1 month 6 days |
RSUs |  |
Shares |  |
Number of nonvested shares outstanding, beginning | 450,000 |
Nonvested shares vested | (77,501) |
Nonvested shares forfeited |  | 450,000
Number of nonvested shares outstanding, ending | 18,770 | 450,000
Restricted Shares |  |
Nonvested restricted stock outstanding, beginning balance (in shares) | 1,014,166 |
Nonvested restricted stock granted (in shares) | 605,000 |
Nonvested restricted stock vested (in shares) | (15,000) |
Nonvested restricted stock forfeited (in shares) | (3,000) |
Nonvested restricted stock outstanding, ending balance (in shares) | 1,601,166 | 1,014,166
Weighted Average Grant Date Fair Value |  |
Weighted average exercise price outstanding, beginning (in usd per share) | $ 3.73 |
Weighted average exercise price outstanding, nonvested options granted (in usd per share) | 3.58 |
Weighted average exercise price outstanding, options vested (in usd per share) | 6.11 |
Weighted average exercise price outstanding, options forfeited (in usd per share) | 5.84 |
Weighted average exercise price outstanding, ending (in usd per share) | $ 3.64 | $ 3.73
Unrecognized stock-based compensation expense | $ 4,456 |
Weighted average remaining vesting period | 2 years 6 months |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Remaining Vesting Period + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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