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Summary of Significant Accounting Policies - Commitments and contingencies (Details)	1 Months Ended
	Nov. 30, 2018 lawsuit fatality
Accounting Policies [Abstract]
Number of fatality | fatality	1
Number of lawsuits | lawsuit	3

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- Definition

Number of Fatality

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No definition available.

+ Details

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X

- Definition

Number of Lawsuits

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No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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