Document and Entity Information Document and Entity Information
3 Months Ended
Jun. 30, 2013
Aug. 01, 2013
Entity Information [Line Items]    
Entity Registrant Name OMNICELL, Inc  
Entity Central Index Key 0000926326  
Document Type 10-Q  
Document Period End Date Jun. 30, 2013  
Amendment Flag false  
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 Common Stock, Shares Outstanding   34,840,670
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q2