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Gross number of share options (or share units) granted during the period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- References

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of non-vested options outstanding.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of non-vested options forfeited.

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Weighted-average contractual term remaining for option award outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of options vested.