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Deferred revenue (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Revenue Recognition [Abstract] |  |
Deferred service revenue, cost of sales, current | $ 13,900 | $ 14,200
Deferred service revenue, noncurrent portion | $ 16,332 | $ 17,051

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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