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Share-based compensation - Stock appreciation rights - Cost related to non-vested awards (Details) - Stock appreciation rights	Sep. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2021	$ 284,886	[1]
2022	828,434
2023	455,100
2024	65,480
Total	$ 1,633,900
[1] Three-month period ending December 31, 2021

X

- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in year four.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in next twelve months.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in year three.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in current year.

+ References

No definition available.

+ Details

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X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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