| Component: (Network and Table) | |
|---|---|
| Network | 100280 - Disclosure - ACCRUED EXPENSES (Tables) (http://www.alnylam.com/20161231/taxonomy/role/DisclosureACCRUEDEXPENSESTables) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001178670 (http://www.sec.gov/CIK) |
| Accrued Liabilities Current [Abstract] | Period [Axis] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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2016-01-01 - 2016-12-31 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Accrued Liabilities Current [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Accrued Expenses | Accrued expenses consist of the following at December 31, 2016 and 2015, in thousands:
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