Condensed Consolidated Statement of Shareholder's Equity (Parenthetical) $ in Millions	9 Months Ended
Dec. 31, 2017 USD ($)
Statement of Stockholders' Equity [Abstract]
Underwriting discounts, commission and offering expenses	$ 0.1

Represents the amount of underwriting discounts and commissions and offering expenses related to a sale of common stock.

No definition available.

Name:	myov_UnderwritingDiscountsCommissionsAndOfferingExpenses
Namespace Prefix:	myov_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration