XML 32 R22.htm IDEA: XBRL DOCUMENT v3.10.0.1

Stockholders' Equity - Common Stock (Details)	9 Months Ended
	Sep. 30, 2018 Vote
Stockholders' Equity
Number of votes per share that common stockholders are entitled to receive	1

X

- Definition

Represents the number of votes per share that common stockholders are entitled to receive.

+ References

No definition available.

+ Details

Name:	mdgl_CommonStockVotingRightsNumber
Namespace Prefix:	mdgl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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