Organization and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies Business Omnicell, Inc. was incorporated in California in 1992 under the name Omnicell Technologies, Inc. and reincorporated in Delaware in 2001 as Omnicell, Inc. The Company’s major products and related services are medication management automation solutions and adherence tools for healthcare systems and pharmacies, which are sold in its principal market, the healthcare industry. The Company’s market is primarily located in the United States and Europe. “Omnicell” or the “Company” collectively refer to Omnicell, Inc. and its subsidiaries. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements reflect, in the opinion of management, all adjustments, consisting of normal recurring adjustments and accruals, necessary to present fairly the financial position of the Company as of September 30, 2021 and December 31, 2020, the results of operations and comprehensive income for the three and nine months ended September 30, 2021 and 2020, and cash flows for the nine months ended September 30, 2021 and 2020. 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 U.S. 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 the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 24, 2021, except as discussed in the section entitled “Recently Adopted Authoritative Guidance” below. The Company’s results of operations and comprehensive income for the three and nine months ended September 30, 2021, and cash flows for the nine months ended September 30, 2021 are not necessarily indicative of results that may be expected for the year ending December 31, 2021, or for any future period. Principles of Consolidation The Condensed Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. On September 9, 2021, the Company completed its acquisition of RxInnovation Inc., operating as FDS Amplicare (“FDS Amplicare”). The Condensed Consolidated Financial Statements include the results of operations of this recently acquired company, commencing as of the acquisition date. The significant accounting policies of the acquired business have been aligned to conform to the accounting policies of Omnicell. Reclassifications and Adjustments Certain prior-year amounts have been reclassified to conform with current-period presentation. This reclassification was a change in the presentation of certain items in the disaggregation of revenues for the three and nine months ended September 30, 2020 in Note 3, Revenues. This change was not deemed material and was included to conform with current-period classification and presentation. Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s Condensed 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. The Company’s critical accounting policies are those that affect its financial statements materially and involve difficult, subjective, or complex judgments by management. As of September 30, 2021, the Company is not aware of any events or circumstances that would require an update to its estimates, judgments, or revisions to the carrying value of its assets or liabilities. Segment Reporting The Company manages its operations as a single segment for the purposes of assessing performance and making operating decisions. The Company's Chief Operating Decision Maker (“CODM”) is its Chief Executive Officer. The CODM allocates resources and evaluates the performance of the Company at the consolidated level using information about its revenues, gross profit, income from operations, and other key financial data. All significant operating decisions are based upon an analysis of the Company as one operating segment, which is the same as its reporting segment. Recently Adopted Authoritative Guidance In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The update simplifies the accounting for income taxes by removing certain exceptions to the general principles in Accounting Standards Codification (“ASC”) 740, Income Taxes, as well as improves consistent application of and simplifies the guidance for other areas of ASC 740 by clarifying and amending existing guidance. The Company adopted ASU 2019-12 on January 1, 2021 on a prospective basis. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements. Recently Issued Authoritative Guidance In August 2020, the FASB issued ASU 2020-06, Debt-Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in Entity’s Own Equity (Subtopic 815-40). The update simplifies the accounting for convertible debt instruments by reducing the number of accounting models and the number of embedded conversion features that could be recognized separately from the primary contract. ASU 2020-06 also enhances transparency and improves disclosures for convertible instruments and earnings per share guidance. This update permits the use of either the modified retrospective or fully retrospective method of transition. The Company will adopt ASU 2020-06 on January 1, 2022, and expects to use the modified retrospective method of transition. The Company’s adoption of the update is estimated to result in an increase in convertible senior notes, net of issuance costs, of $75.4 million; a decrease in additional paid-in capital of $72.7 million; a decrease of long-term deferred tax liabilities of $19.8 million; a decrease in long-term deferred tax assets of $0.5 million; and an increase in retained earnings of $16.7 million, all as of January 1, 2022. There was no other recently issued and effective authoritative guidance that is expected to have a material impact on the Company’s Condensed Consolidated Financial Statements through the reporting date.