Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v2.4.0.6
Document and Entity Information
6 Months Ended
Jun. 30, 2012
Aug. 08, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name LIGAND PHARMACEUTICALS INC  
Entity Central Index Key 0000886163  
Document Type 10-Q/A  
Document Period End Date Jun. 30, 2012  
Amendment Flag true  
Amendment Description Amendment No. 1  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   19,936,740