v2.4.0.6
Document and Entity Information
6 Months Ended
Jun. 30, 2013
Jul. 30, 2013
Class A common stock
Jul. 30, 2013
Class B common stock
Entity Registrant Name IRONWOOD PHARMACEUTICALS INC    
Entity Central Index Key 0001446847    
Document Type 10-Q    
Document Period End Date Jun. 30, 2013    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   95,321,057 25,472,529
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q2