v3.8.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Feb. 23, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name APPLIED OPTOELECTRONICS, INC.    
Entity Central Index Key 0001158114    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Is Entity's Reporting Status Current? Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,121,657,372
Entity Common Stock, Shares Outstanding   19,500,728  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017