Sale of Stock, Authorized Amount

No definition available.

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- Definition

Sale of Stock, Remaining Authorized Amount

+ References

No definition available.

+ Details

Name:	myov_SaleofStockRemainingAuthorizedAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

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No definition available.

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Name:	us-gaap_SaleOfStockConsiderationReceivedPerTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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No definition available.

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Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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.

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No definition available.

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- Details

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- Details

Name:	us-gaap_CounterpartyNameAxis=myov_RoivantSciencesLtd.Member
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Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=myov_CowenandCompanyLLCMember
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Data Type:	na
Balance Type:
Period Type:

Shareholders' Equity - Narrative (Details) - Private Placement - USD ($)		1 Months Ended		3 Months Ended
	Apr. 02, 2018	Apr. 30, 2018	Oct. 31, 2017	Jun. 30, 2018
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)			138,361
Net proceeds from sale of shares			$ 2,000,000
Roivant Sciences, Ltd.
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	1,110,015
Price of shares (in USD per share)	$ 20.27
Gross proceeds from sale of shares		$ 22,500,000
Cowen and Company, LLC
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)				2,767,129
Price of shares (in USD per share)				$ 21.47
Aggregate offering price	$ 100,000,000
Net proceeds from sale of shares				$ 57,300,000
Remaining capacity in offering program				$ 40,600,000