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Organization and Summary of Significant Accounting Policies - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |
Short-term unbilled receivable - included in accounts receivable and unbilled | $ 4,859 | $ 4,590
Long-term unbilled receivable - included in other long-term assets | 10,877 | 9,475
Total contract assets | 15,736 | 14,065
Short-term deferred revenue | 95,709 | 78,774
Long-term deferred revenue | 8,806 | 10,623
Total contract liabilities | $ 104,515 | $ 89,397

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- Definition Contract with Customer, Asset, Net + References No definition available. + Details
Name: | omcl_ContractwithCustomerAssetNet
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with Customer, Asset, Net, Current + References No definition available. + Details
Name: | omcl_ContractwithCustomerAssetNetCurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with Customer, Asset, Net, Noncurrent + References No definition available. + Details
Name: | omcl_ContractwithCustomerAssetNetNoncurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with Customer, Liability + References No definition available. + Details
Name: | omcl_ContractwithCustomerLiability
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability, Deferred Revenue, Current + References No definition available. + Details
Name: | omcl_ContractwithCustomerLiabilityDeferredRevenueCurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability, Deferred Revenue, Noncurrent + References No definition available. + Details
Name: | omcl_ContractwithCustomerLiabilityDeferredRevenueNoncurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration