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Organization and Summary of Significant Accounting Policies - Accounts Receivable Concentration (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 customer | Sep. 30, 2014 customer | Dec. 31, 2013 customer
Accounting Policies [Abstract] |  |  |
Customers with 10% revenue concentration | 0 | 0 |
Customers with 10 % accts rec concentration |  | 0 | 0

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- 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
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Namespace Prefix: | omcl_
Data Type: | xbrli:integerItemType
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:integerItemType
Balance Type: | na
Period Type: | duration

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