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STOCKHOLDERS’ EQUITY - Summary of Unvested Options and Changes (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
May 30, 2019 | Dec. 31, 2020
Stock Options |  |
Options |  |
Granted (in shares) | 5,542,668 |
Parent Company |  |
Options |  |
Granted (in shares) |  | 2,292,000
Weighted Average Grant Date Fair Value |  |
Total fair value of options vested |  | $ 6.1
Parent Company | Stock Options |  |
Options |  |
Unvested at beginning of period (in shares) |  | 4,517,000
Granted (in shares) |  | 2,292,000
Vested (in shares) |  | (1,157,000)
Forfeited (in shares) |  | (161,000)
Unvested at end of period (in shares) |  | 5,491,000
Weighted Average Grant Date Fair Value |  |
Unvested at beginning of period (in dollars per share) |  | $ 5.28
Granted (in dollars per share) |  | 4.76
Vested (in dollars per share) |  | 5.29
Forfeited (in dollars per share) |  | 5.20
Unvested at end of period (in dollars per share) |  | $ 5.06

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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