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Deferred revenue - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Revenue Recognition [Abstract] |  |
Deferred service revenue, cost of sales, current | $ 17,900 | $ 15,700
Deferred service revenue, noncurrent portion | $ 17,096 | $ 17,975

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- Definition Deferred Cost of Services, Current + References No definition available. + Details
Name: | omcl_DeferredCostofServicesCurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred Revenue, Services, Noncurrent + References No definition available. + Details
Name: | omcl_DeferredRevenueServicesNoncurrent
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_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration