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Employee Benefits and Share-Based Compensation - Stock Purchase Plan (Details) (1997 Employee Stock Purchase Plan [Member], Employee Stock [Member], USD $) Share data in Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
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May 19, 2009 | Dec. 31, 2014
1997 Employee Stock Purchase Plan [Member] | Employee Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum percentage of earnings allowed for purchase of shares |  | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Maximum amount of annual salary permitted to utilize |  | $ 25,000 omcl_SharebasedCompensationArrangementbySharebasedPaymentAwardFairMarketThresholdforSharesPurchased / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Purchase price of common stock, percent |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Offering period |  | 24 months
Purchase period |  | 6 months
Shares added to reserved for future issuance | 2.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember |
Shares reserved for future issuance |  | 0.6 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Share of common stock purchased |  | 0.5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Shares issued for the 1997 Employee Stock Purchase Plan |  | 4.7 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Unrecognized compensation cost |  | $ 1,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Weighted average period of compensation cost recognized |  | 8 months 12 days

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Market Threshold for Shares Purchased + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Employee Purchase Plan, Purchase Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Employee Share Purchase Plan, Offering Period + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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