Revenue - Schedules of concentration of risk (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021
Revenue Concentration \| Customer concentration \| Epicel
Product Information [Line Items]
Concentration risk (as a percent)	9.00%	11.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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