Additional Upfront Fee To Be Paid On Certain Achievement

No definition available.

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- Definition

Development milestone and upfront fee recognized as research and development expense.

+ References

No definition available.

+ Details

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- Definition

One time upfront payment to purchase future royalties.

+ References

No definition available.

+ Details

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- Definition

Upfront fee to be paid on development and sales milestone achievement.

+ References

No definition available.

+ Details

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- Definition

Upfront fee to be paid on execution of amendment.

+ References

No definition available.

+ Details

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- 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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- Definition

Gross carrying amount as of the balance sheet date of certain rights acquired to exercise a certain privilege or pursue a particular business or occupation and which is deemed to have a finite economic life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Significant Agreements - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended	9 Months Ended
	Jun. 30, 2016	Apr. 30, 2013	Sep. 30, 2016	Sep. 30, 2016
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Up-front payment to purchase future royalties		$ 30,000,000
Up-front payment upon execution of amendment	$ 7,000,000
Development milestone and up-front payments			$ 300,000	$ 7,300,000
Sales milestone recorded as an in-license right			1,000,000	1,000,000
Maximum [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Additional payments to UWA on successful achievement	$ 20,000,000	20,000,000
EXONDYS 51 and Up to Five Additional Products [Member] \| Maximum [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payments to UWA on successful achievement of certain development and sales milestones		$ 6,000,000
EXONDYS 51 [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Sales milestone recorded as an in-license right			$ 1,000,000	$ 1,000,000