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Equity Offerings - Narrative (Details) - Distribution Agreement - USD ($) |  | 9 Months Ended
--- | --- | ---
Nov. 03, 2017 | Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items] |  |
Maximum aggregate offering price | $ 125,000,000.0 |
Consideration received |  | $ 38,500,000
Issuance Costs |  | $ 700,000
Number of Shares Issued ( in shares ) |  | 460,000
Average price (per share) |  | $ 83.81
Available to be offered |  | $ 31,500,000

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- Definition Sale of Stock, Authorized Amount + References No definition available. + Details
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Period Type: | duration

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- Definition Sale of Stock, Available for Issuance + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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