Organization	9 Months Ended
Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1. Organization Description of Business Inari Medical, Inc. (the “Company”) was incorporated in Delaware in July 2011 and is headquartered in Irvine, California. The Company develops, manufactures, markets and sells devices for the interventional treatment of venous diseases. The Company received initial 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) in February 2015 for its FlowTriever system, used primarily to treat pulmonary emboli, and in February 2017 for its ClotTriever system, used for the treatment of deep vein thrombosis. Initial Public Offering In May 2020, the Company completed an initial public offering (“IPO”) of its common stock. As part of the IPO, the Company issued and sold 9,432,949 shares of its common stock, which included 1,230,384 shares sold pursuant to the exercise of the underwriters’ over-allotment option, at a public offering price of $19.00 per share. The Company received net proceeds of approximately $163.0 million from the IPO, after deducting underwriters’ discounts and commissions of $12.6 million and offering costs of $3.7 million, of which $1.4 million was incurred as of December 31, 2019. Upon the completion of the IPO, all shares of Series A, B, and C redeemable convertible preferred stock then outstanding were converted into 31,968,570 shares of common stock on a one-to-one basis. In addition, on the completion of the IPO, all the Company’s outstanding preferred stock warrants were converted into warrants to purchase an aggregate of 256,588 shares of common stock, which resulted in the reclassification of the convertible preferred stock warrant liability to additional paid-in capital. In connection with the Company’s IPO, in May 2020, the Company’s certificate of incorporation was amended and restated to provide for 300,000,000 authorized shares of common stock with a par value of $0.001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.001 per share. Reverse Stock Splits In March 2020, the Company’s board of directors approved an amendment to the Company’s certificate of incorporation to effect a reverse split of shares of the Company’s common stock and redeemable convertible preferred stock on a 1-for-1.19 basis. In May 2020, the Company’s board of directors approved an amendment to the Company’s certificate of incorporation to effect a second reverse split of shares of the Company’s common stock and redeemable convertible preferred stock on a 1-for-1.20 basis. All common stock, redeemable convertible preferred stock, warrants, stock options, RSUs and per share information presented in the financial statements have been adjusted to reflect the effect of both reverse stock splits on a retroactive basis for all periods presented. Any fractional shares resulting from the reverse stock splits are rounded down to a whole share.

Organization

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. Organization

Description of Business

Inari Medical, Inc. (the “Company”) was incorporated in Delaware in July 2011 and is headquartered in Irvine, California. The Company develops, manufactures, markets and sells devices for the interventional treatment of venous diseases. The Company received initial 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) in February 2015 for its FlowTriever system, used primarily to treat pulmonary emboli, and in February 2017 for its ClotTriever system, used for the treatment of deep vein thrombosis.

Initial Public Offering

In May 2020, the Company completed an initial public offering (“IPO”) of its common stock. As part of the IPO, the Company issued and sold 9,432,949 shares of its common stock, which included 1,230,384 shares sold pursuant to the exercise of the underwriters’ over-allotment option, at a public offering price of $19.00 per share. The Company received net proceeds of approximately $163.0 million from the IPO, after deducting underwriters’ discounts and commissions of $12.6 million and offering costs of $3.7 million, of which $1.4 million was incurred as of December 31, 2019. Upon the completion of the IPO, all shares of Series A, B, and C redeemable convertible preferred stock then outstanding were converted into 31,968,570 shares of common stock on a one-to-one basis.

In addition, on the completion of the IPO, all the Company’s outstanding preferred stock warrants were converted into warrants to purchase an aggregate of 256,588 shares of common stock, which resulted in the reclassification of the convertible preferred stock warrant liability to additional paid-in capital.

In connection with the Company’s IPO, in May 2020, the Company’s certificate of incorporation was amended and restated to provide for 300,000,000 authorized shares of common stock with a par value of $0.001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.001 per share.

Reverse Stock Splits

In March 2020, the Company’s board of directors approved an amendment to the Company’s certificate of incorporation to effect a reverse split of shares of the Company’s common stock and redeemable convertible preferred stock on a 1-for-1.19 basis.

In May 2020, the Company’s board of directors approved an amendment to the Company’s certificate of incorporation to effect a second reverse split of shares of the Company’s common stock and redeemable convertible preferred stock on a 1-for-1.20 basis. All common stock, redeemable convertible preferred stock, warrants, stock options, RSUs and per share information presented in the financial statements have been adjusted to reflect the effect of both reverse stock splits on a retroactive basis for all periods presented. Any fractional shares resulting from the reverse stock splits are rounded down to a whole share.