Rendering

Component: (Network and Table)
Network
100540 - Disclosure - Schedule of Domestic and Foreign Components of Loss before Income Taxes (Detail)
(http://www.alnylam.com/20161231/taxonomy/role/DisclosureScheduleOfDomesticAndForeignComponentsOfLossBeforeIncomeTaxesDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001178670 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Income (Loss) Before Income Tax
 
 
 
Domestic
(350,704,000) 
(245,681,000) 
(372,137,000) 
Foreign
(59,404,000) 
(44,392,000) 
(28,467,000) 
Loss before income taxes
(410,108,000) 
 
(290,073,000) 
 
(400,604,000)