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v3.21.2

Consolidated Statements of Stockholder's Deficit (Parenthetical) | 7 Months Ended
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Dec. 31, 2018 $ / shares
GS Acquisition Holdings Corp II [Member] |
Sale of common stock per share | $ 0.0002

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- Definition Sale of common stock per share. + References No definition available. + Details
Name: | mir_SaleOfCommonStockPerShare
Namespace Prefix: | mir_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=mir_GsAcquisitionHoldingsCorpIiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |