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Commitments and Contingencies - Major Vendors (Details) - item	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commitments and Contingencies
Number of vendors	2	2
Purchases | Vendor
Commitments and Contingencies
Total purchases (in percentage)	33.00%	32.00%

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- Definition

Represents the number of vendors.

+ References

No definition available.

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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

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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