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STOCKHOLDERS' EQUITY - Unvested awards (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Unvested restricted stock |
Unrecognized compensation cost | $ 66,962
Expected weighted-average period in years of compensation cost to be recognized | 1 year
Stock options |
Unrecognized compensation cost | $ 523
Expected weighted-average period in years of compensation cost to be recognized | 1 year

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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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