Description of Business	3 Months Ended
Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. Description of Business Outset Medical, Inc. (the “Company”) was originally incorporated on May 5, 2003 in the state of Delaware under the name Home Dialysis Plus, Ltd. The name of the Company was changed to Outset Medical, Inc. on January 5, 2015. Outset Medical, Inc. is a medical technology company pioneering a first-of-its-kind technology to reduce the cost and complexity of dialysis. The Tablo Hemodialysis System enables dialysis care in acute and chronic settings. The Company’s headquarters are located in San Jose, CA. The Company’s registration statement on Form S-1 related to its initial public offering (IPO) was declared effective by the Securities and Exchange Commission (SEC) on September 14, 2020, and the Company’s common stock began trading on the Nasdaq Global Select Market on September 15, 2020. Upon the completion of the IPO, the Company sold 10,294,000 shares of common stock (which included 1,343,000 shares that were sold pursuant to the full exercise of the underwriters’ option to purchase additional shares in connection with the IPO) at a price to the public of $27.00 per share. Including the full exercise of the underwriters’ option to purchase additional shares, the Company received aggregate net proceeds of $254.8 million after deducting offering costs, underwriting discounts and commissions of $23.1 million. On April 13, 2021, the Company completed a follow-on public offering and sold 2,946,000 shares of common stock (see Note 11 for further discussion). Reverse Stock Split In September 2020, the Company’s board of directors and shareholders approved a certificate of amendment to the amended and restated certificate of incorporation to effect a reverse split of shares of the Company’s common stock on a 7.9-for-one basis (the “Reverse Stock Split”) effective as of September 8, 2020. The number of authorized shares and the par values of the common stock and redeemable convertible preferred stock were not adjusted as a result of the Reverse Stock Split. In connection with the Reverse Stock Split, the conversion ratio for the Company’s outstanding redeemable convertible preferred stock was proportionately adjusted such that the common stock issuable upon conversion of such preferred stock was decreased in proportion to the Reverse Stock Split. All references to common stock and options to purchase common stock share data, per share data and related information contained in these condensed financial statements have been retrospectively adjusted to reflect the effect of the Reverse Stock Split for all periods presented. Liquidity Since inception, the Company has incurred net losses and negative cash flows from operations. During the three months ended March 31, 2021 and 2020, the Company incurred a net loss of $30.0 million and $20.7 million, respectively. As of March 31, 2021, the Company had an accumulated deficit of $524.1 million. As of March 31, 2021, the Company had cash, cash equivalents and short-term investments of $277.5 million, which are available to fund future operations, and restricted cash of $33.3 million, for a total cash, cash equivalents, restricted cash and short-term investments balance of $310.8 million. Management expects to continue to incur significant expenses for the foreseeable future and to incur operating losses in the near term while the Company makes investments to support its anticipated growth. Management believes that the Company’s existing cash, cash equivalents and short-term investments, which include the proceeds from the IPO, and cash generated from revenues from its products and services, as well as the proceeds from the follow-on public offering (see Note 11 for further discussion), will be sufficient to meet its anticipated needs for at least the next 12 months from the issuance date of the accompanying condensed financial statements. Basis of Presentation The accompanying condensed financial statements are unaudited and have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, that are necessary for the fair statement of the Company’s financial position, results of operations, comprehensive loss and cash flows for the interim periods presented. The financial data and the other financial information disclosed in these notes to the condensed financial statements related to the three-month period are also unaudited. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results of operations to be anticipated for any other future annual or interim period. The condensed balance sheet as of December 31, 2020 included herein was derived from the audited financial statements as of that date. These unaudited condensed financial statements should be read in conjunction with the Company’s audited financial statements and related notes for the year ended December 31, 2020, which are included in the Annual Report on Form 10-K filed with SEC on March 22, 2021. All share amounts disclosed in the notes to the condensed financial statements are rounded to the nearest thousand except for per share data.

Description of Business

3 Months Ended

Mar. 31, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. Description of Business

Outset Medical, Inc. (the “Company”) was originally incorporated on May 5, 2003 in the state of Delaware under the name Home Dialysis Plus, Ltd. The name of the Company was changed to Outset Medical, Inc. on January 5, 2015. Outset Medical, Inc. is a medical technology company pioneering a first-of-its-kind technology to reduce the cost and complexity of dialysis. The Tablo Hemodialysis System enables dialysis care in acute and chronic settings. The Company’s headquarters are located in San Jose, CA.

The Company’s registration statement on Form S-1 related to its initial public offering (IPO) was declared effective by the Securities and Exchange Commission (SEC) on September 14, 2020, and the Company’s common stock began trading on the Nasdaq Global Select Market on September 15, 2020. Upon the completion of the IPO, the Company sold 10,294,000 shares of common stock (which included 1,343,000 shares that were sold pursuant to the full exercise of the underwriters’ option to purchase additional shares in connection with the IPO) at a price to the public of $27.00 per share. Including the full exercise of the underwriters’ option to purchase additional shares, the Company received aggregate net proceeds of $254.8 million after deducting offering costs, underwriting discounts and commissions of $23.1 million.

On April 13, 2021, the Company completed a follow-on public offering and sold 2,946,000 shares of common stock (see Note 11 for further discussion).

Reverse Stock Split

In September 2020, the Company’s board of directors and shareholders approved a certificate of amendment to the amended and restated certificate of incorporation to effect a reverse split of shares of the Company’s common stock on a 7.9-for-one basis (the “Reverse Stock Split”) effective as of September 8, 2020. The number of authorized shares and the par values of the common stock and redeemable convertible preferred stock were not adjusted as a result of the Reverse Stock Split. In connection with the Reverse Stock Split, the conversion ratio for the Company’s outstanding redeemable convertible preferred stock was proportionately adjusted such that the common stock issuable upon conversion of such preferred stock was decreased in proportion to the Reverse Stock Split. All references to common stock and options to purchase common stock share data, per share data and related information contained in these condensed financial statements have been retrospectively adjusted to reflect the effect of the Reverse Stock Split for all periods presented.

Liquidity

Since inception, the Company has incurred net losses and negative cash flows from operations. During the three months ended March 31, 2021 and 2020, the Company incurred a net loss of $30.0 million and $20.7 million, respectively. As of March 31, 2021, the Company had an accumulated deficit of $524.1 million.

As of March 31, 2021, the Company had cash, cash equivalents and short-term investments of $277.5 million, which are available to fund future operations, and restricted cash of $33.3 million, for a total cash, cash equivalents, restricted cash and short-term investments balance of $310.8 million. Management expects to continue to incur significant expenses for the foreseeable future and to incur operating losses in the near term while the Company makes investments to support its anticipated growth. Management believes that the Company’s existing cash, cash equivalents and short-term investments, which include the proceeds from the IPO, and cash generated from revenues from its products and services, as well as the proceeds from the follow-on public offering (see Note 11 for further discussion), will be sufficient to meet its anticipated needs for at least the next 12 months from the issuance date of the accompanying condensed financial statements.

Basis of Presentation

The accompanying condensed financial statements are unaudited and have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) and on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, that are necessary for the fair statement of the Company’s financial position, results of operations, comprehensive loss and cash flows for the interim periods presented. The financial data and the other financial information disclosed in these notes to the condensed financial statements related to the three-month period are also unaudited. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results of operations to be anticipated for any other future annual or interim period. The condensed balance sheet as of December 31, 2020 included herein was derived from the audited financial statements as of that date.

These unaudited condensed financial statements should be read in conjunction with the Company’s audited financial statements and related notes for the year ended December 31, 2020, which are included in the Annual Report on Form 10-K filed with SEC on March 22, 2021.

All share amounts disclosed in the notes to the condensed financial statements are rounded to the nearest thousand except for per share data.