v3.8.0.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2018
May 01, 2018
Document And Entity Information [Abstract]    
Entity Registrant Name Albireo Pharma, Inc.  
Entity Central Index Key 0001322505  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Type 10-Q  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Trading Symbol ALBO  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   11,941,939