Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of presentation. These interim condensed consolidated financial statements are unaudited but reflect, in the opinion of management, all adjustments, consisting of normal recurring adjustments and accruals, necessary to present fairly the financial position of Omnicell and its subsidiaries as of March 31, 2014, the results of their operations, comprehensive income and cash flows for the three months ended March 31, 2014 and 2013. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), have been condensed or omitted in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2013. Our results of operations, comprehensive income and cash flows for the three months ended March 31, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014, or for any future period.
Use of Estimates, Policy [Policy Text Block]	Use of estimates. GAAP requires management to make estimates and assumptions that affect the amounts reported in our consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and various other assumptions believed to be reasonable. Although these estimates are based on management's best knowledge of current events and actions that may impact the company in the future, actual results may be different from the estimates. Our critical accounting policies are those that affect our financial statements materially and involve difficult, subjective or complex judgments by management. Those policies are revenue recognition, share-based compensation, inventory valuation, valuation of goodwill and purchased intangibles, valuation of long-lived assets and accounting for income taxes.
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]	Principles of consolidation. The condensed consolidated financial statements include the accounts of our wholly-owned subsidiaries. All significant inter-company accounts and transactions have been eliminated in consolidation
Receivables, Policy [Policy Text Block]	Concentration of credit risk. Financial instruments that may potentially subject us to concentrations of credit risk consist principally of cash equivalents and accounts receivable. Cash equivalents are maintained with several financial institutions and may exceed the amount of insurance provided on such balances. The majority of our accounts receivable are derived from sales to customers for commercial applications. We perform ongoing credit evaluations of our customers’ financial condition and limit the amount of credit extended when deemed necessary but generally require no collateral. We maintain reserves for potential credit losses. Our products are broadly distributed and there was no single customer accounting for 10% or more of revenues in the three months ended March 31, 2014. Additionally, there was no single customer accounting for 10% or more of accounts receivable at March 31, 2014 or December 31, 2013. We believe that we have no significant concentrations of credit risk at March 31, 2014.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards In July 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. We adopted the amendments in ASU 2013-11 in the first quarter of 2014. This update did not have a significant impact on our financial position, operating results or cash flows.
Earnings Per Share, Policy [Policy Text Block]	Basic net income per share is computed by dividing net income for the period by the weighted average number of shares outstanding during the period, less shares subject to repurchase. Diluted net income per share is computed by dividing net income for the period by the weighted average number of shares, less shares subject to repurchase, plus, if dilutive, potential common stock outstanding during the period. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards and restricted stock units computed using the treasury stock method. Since their impact is anti-dilutive, we excluded 347,265 and 1,865,589 shares from the calculations of diluted net income per share for the three months ended March 31, 2014 and 2013, respectively.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	We account for share-based awards granted to employees and directors, including employee stock option awards, restricted stock, PSUs and RSUs issued pursuant to the 2009 Plan and employee stock purchases made under our ESPP using the estimated grant date fair value method of accounting in accordance with ASC 718, Stock Compensation. We value options and ESPP shares using the Black-Scholes-Merton option-pricing model. Restricted stock and time-based RSUs are valued at the grant date fair value of the underlying common shares. The PSUs are valued via Monte Carlo simulation

Organization and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting, Policy [Policy Text Block]

Basis of presentation. These interim condensed consolidated financial statements are unaudited but reflect, in the opinion of management, all adjustments, consisting of normal recurring adjustments and accruals, necessary to present fairly the financial position of Omnicell and its subsidiaries as of March 31, 2014, the results of their operations, comprehensive income and cash flows for the three months ended March 31, 2014 and 2013. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), have been condensed or omitted in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”). These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2013.

Our results of operations, comprehensive income and cash flows for the three months ended March 31, 2014 are not necessarily indicative of results that may be expected for the year ending December 31, 2014, or for any future period.

Use of Estimates, Policy [Policy Text Block]

Use of estimates. GAAP requires management to make estimates and assumptions that affect the amounts reported in our consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and various other assumptions believed to be reasonable. Although these estimates are based on management's best knowledge of current events and actions that may impact the company in the future, actual results may be different from the estimates. Our critical accounting policies are those that affect our financial statements materially and involve difficult, subjective or complex judgments by management. Those policies are revenue recognition, share-based compensation, inventory valuation, valuation of goodwill and purchased intangibles, valuation of long-lived assets and accounting for income taxes.

Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]

Principles of consolidation. The condensed consolidated financial statements include the accounts of our wholly-owned subsidiaries. All significant inter-company accounts and transactions have been eliminated in consolidation

Receivables, Policy [Policy Text Block]

Concentration of credit risk. Financial instruments that may potentially subject us to concentrations of credit risk consist principally of cash equivalents and accounts receivable. Cash equivalents are maintained with several financial institutions and may exceed the amount of insurance provided on such balances. The majority of our accounts receivable are derived from sales to customers for commercial applications. We perform ongoing credit evaluations of our customers’ financial condition and limit the amount of credit extended when deemed necessary but generally require no collateral. We maintain reserves for potential credit losses. Our products are broadly distributed and there was no single customer accounting for 10% or more of revenues in the three months ended March 31, 2014. Additionally, there was no single customer accounting for 10% or more of accounts receivable at March 31, 2014 or December 31, 2013. We believe that we have no significant concentrations of credit risk at March 31, 2014.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Standards

In July 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. We adopted the amendments in ASU 2013-11 in the first quarter of 2014. This update did not have a significant impact on our financial position, operating results or cash flows.

Earnings Per Share, Policy [Policy Text Block]

Basic net income per share is computed by dividing net income for the period by the weighted average number of shares outstanding during the period, less shares subject to repurchase. Diluted net income per share is computed by dividing net income for the period by the weighted average number of shares, less shares subject to repurchase, plus, if dilutive, potential common stock outstanding during the period. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards and restricted stock units computed using the treasury stock method. Since their impact is anti-dilutive, we excluded 347,265 and 1,865,589 shares from the calculations of diluted net income per share for the three months ended March 31, 2014 and 2013, respectively.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

We account for share-based awards granted to employees and directors, including employee stock option awards, restricted stock, PSUs and RSUs issued pursuant to the 2009 Plan and employee stock purchases made under our ESPP using the estimated grant date fair value method of accounting in accordance with ASC 718, Stock Compensation.

We value options and ESPP shares using the Black-Scholes-Merton option-pricing model. Restricted stock and time-based RSUs are valued at the grant date fair value of the underlying common shares. The PSUs are valued via Monte Carlo simulation

- Definition

Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.

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- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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- Definition

Disclosure of accounting policy for trade and other accounts receivable, and finance, loan and lease receivables, including those classified as held for investment and held for sale. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the valuation allowance for receivables is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of origination fees and costs, including the amortization method for net deferred fees or costs (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status and (7) the treatment of foreclosures or repossessions (8) the nature and amount of any guarantees to repurchase receivables.

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