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Common Stock - Voting and Dividends (Details)	9 Months Ended	106 Months Ended
	Sep. 30, 2016 vote	Sep. 30, 2016 USD ($)
Stockholders' Equity Note [Abstract]
Number of votes per common stock | vote	1
Cash dividends | $		$ 0

X

- Definition

Represents the number of votes for each share of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	mirn_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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