v3.10.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Feb. 22, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name ALIMERA SCIENCES INC    
Entity Central Index Key 0001267602    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity Public Float     $ 60,577,309
Entity Common Stock, Shares Outstanding   70,968,630