v3.19.2

Government assistance (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Government assistance
Research and development expenditures eligible for investment tax credits	$ 171	$ 148

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- References

No definition available.

+ Details

Name:	mist_GovernmentAssistanceAbstract
Namespace Prefix:	mist_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Provincial refundable tax credit based on incurred research and development expenditures, recorded as a reduction to research and development expenses.

+ References

No definition available.

+ Details

Name:	mist_ResearchAndDevelopmentExpensesExpendituresEligibleForTaxCredits
Namespace Prefix:	mist_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration