Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=myo_ChiefExecutiveOfficerAndDirectorAgreementMember
Namespace Prefix:
Data Type:	na
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- Details

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Revolving Line of Credit - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 20, 2017	Dec. 31, 2017	Jun. 08, 2017
Line of Credit Facility [Line Items]
Proceeds from issuance of common stock		$ 10,407,706
Revolving Credit Facility [Member] \| Chief Executive Officer and Director Agreement [Member]
Line of Credit Facility [Line Items]
Revolving line of credit			$ 1,000,000
Revolving line of credit, description		The line of credit will bear an interest rate of 10% of per annum and will terminate upon the earlier of (i) December 31, 2018; and (ii) the Company entering into a debt or loan facility with a bank or non-bank lender in the aggregate amount of not less than the greater of (A) $500,000 and (B) the then outstanding principal and interest under the facility.
Revolving Credit Facility [Member] \| Over-allotment Option [Member]
Line of Credit Facility [Line Items]
Proceeds from issuance of common stock	$ 11,500,000