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Organization and Summary of Significant Accounting Policies Accounts Receivable Concentration (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 customer | Mar. 31, 2013 customer | Dec. 31, 2013 customer
Concentration Risk [Line Items] |  |  |
customers with 10% revenue concentration | 0 | 0 |
customers with 10 % accts rec concentration | 0 |  | 0

X
- Definition customers with 10 % accts rec concentration = number of customers with greater than or equal to 10% of Accts Receivable for the reported balance sheet date + References No definition available. + Details
Name: | omcl_CustomersWith10AcctsRecConcentration
Namespace Prefix: | omcl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition customers with 10% revenue concentration - number of customers with greater than or equal to 10% of revenues for the period reported + References No definition available. + Details
Name: | omcl_CustomersWith10RevenueConcentration
Namespace Prefix: | omcl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration