v2.4.0.8
Document and Entity Information
9 Months Ended
Sep. 30, 2015
Oct. 23, 2015
Document Information [Line Items]    
Trading Symbol ALGN  
Entity Registrant Name ALIGN TECHNOLOGY INC  
Entity Central Index Key 0001097149  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Sep. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   79,490,148