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Network
145 - Disclosure - Share-Based Payments - Summary of Unvested RSUs Activity (Detail)
(http://agios.com/taxonomy/role/DisclosureShareBasedPaymentsSummaryOfUnvestedRSUsActivity)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001439222 (http://www.sec.gov/CIK)
Award Type [Axis]Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Unvested shares beginning of period
15,000  
  
Granted
69,550  
15,000  
10,000  
Vested
(7,500) 
  
Unvested shares end of period
77,050  
 
15,000  
 
 
 
Weighted-average grant date fair value, Unvested shares beginning of period
122.22  
  
Weighted-average grant date fair value, Granted
41.77  
  
Weighted-average grant date fair value, Vested
122.22  
  
Weighted-average grant date fair value, Unvested shares end of period
49.60  
122.22