Company and Nature of Business	9 Months Ended
Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Company and Nature of Business	Note 1. Company and Nature of Business Description of Business Sight Sciences, Inc. (the “Company”) was incorporated in the State of Delaware in 2010. The Company is located and headquartered in Menlo Park, California and has its principal commercial offices in Southlake, Texas. The Company is an ophthalmic medical device company focused on the development and commercialization of surgical and nonsurgical technologies for the treatment of prevalent eye diseases. The Company’s surgical glaucoma product portfolio features the OMNI® Surgical System, a device that facilitates the performance of both trabeculotomy and canaloplasty with a single device and single corneal incision. The Company’s nonsurgical dry eye product portfolio consists of the TearCare® System ("TearCare") for ophthalmologists and optometrists. TearCare is a wearable eyelid technology that delivers highly targeted and adjustable heat to the meibomian glands of the eyelids. Stock Split On July 7, 2021 the Company effected a 2-for-1 stock split of its issued and outstanding shares of common stock and a proportional adjustment to the existing conversion ratios for each series of the Company’s redeemable convertible preferred stock. Accordingly, all share and per share amounts for all periods presented in the accompanying condensed consolidated financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect this stock split and adjustment of the redeemable convertible preferred stock conversion ratios. Initial Public Offering On July 19, 2021, the Company closed its initial public offering (“IPO”) of its common stock in which the Company issued and sold 10,000,000 shares of its common stock, and sold an additional 1,500,000 shares of common stock upon the full exercise of the underwriters’ option to purchase additional shares of the Company's common stock. These sales occurred at the initial public offering price of $24.00 per share. The Company received net proceeds of approximately $252.2 million from the IPO, after deducting underwriting discounts and commissions of $19.3 million and offering costs of $4.5 million, of which $0.4 million were incurred as of December 31, 2020. Immediately prior to the closing of the IPO, all then-outstanding shares of redeemable convertible preferred stock were converted into 25,534,404 shares of common stock. Further, all outstanding redeemable convertible preferred stock warrants were converted into warrants to purchase 659,028 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 July 2021, the Company’s certificate of incorporation was amended and restated to provide for 200,000,000 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. Significant Risks and Uncertainties Since inception, the Company has incurred losses and negative cash flows from operations. As of September 30, 2021, the Company had an accumulated deficit of $137.1 million and recorded a net loss of $47.0 million for the nine months then ended and expects to incur future additional losses. If the Company’s revenue levels from its products are not sufficient or if the Company is unable to secure additional funding when desired, the Company may need to delay the development of its products and scale back its business and operations. The Company believes that its existing sources of liquidity will satisfy its working capital and capital requirements for at least 12 months from the issuance of its financial statements. Failure to generate sufficient revenues, achieve planned gross margins, or control operating costs will require the Company to raise additional capital through equity or debt financing. Such additional financing may not be available on acceptable terms, or at all, and could require the Company to modify, delay, or abandon some of its planned future expansion or expenditures or reduce some of its ongoing operating costs, which could harm its business, operating results, financial condition, and ability to achieve its intended business objectives. On March 11, 2020, the World Health Organization declared the coronavirus disease 2019 (“COVID-19”) outbreak a global pandemic recommending containment measures worldwide. On March 16, 2020 the Company implemented alternative work arrangements for its employees and limited its employees’ travel activities to protect its employees and to comply with the provisions described within the local shelter in place order. Certain U.S. federal, state and local governmental authorities issued other orders and directives, including restrictions on elective procedures and therapies, aimed at minimizing the spread of COVID-19. As such, the COVID-19 pandemic impacted and is expected to continue to impact demand for the Company’s products, which are used in procedures and therapies that are considered elective. Although some of the governmental restrictions have since been lifted or scaled back, recent and future surges of COVID-19, including recent surges in the delta variant of COVID-19, may result in restrictions being re-implemented in response to efforts to reduce the spread of COVID-19. The ultimate impact of the COVID-19 pandemic on the Company’s operations is unknown and will depend on future developments which are highly uncertain and cannot be predicted with confidence, including the duration and severity of the COVID-19 outbreak (including prevalence and effect of the delta variant and other potential COVID-19 variants), the status of health and safety actions taken to contain its spread and any additional preventative and protective actions that governments or the Company may direct, any resurgence of COVID-19 that may occur and how quickly and to what extent economic and operating conditions normalize within the markets in which the Company operates. The COVID-19 pandemic could disrupt the operations of the Company’s third-party manufacturers and other suppliers. Although the Company has not experienced material disruptions in its supply chain to date, it cannot predict how long the pandemic and measures intended to contain the spread of COVID-19 will continue and what effect COVID-19 and the associated containment measures will have on our suppliers and vendors, in particular for any of the Company’s suppliers and vendors that may not qualify as essential businesses and suffer more significant disruptions to their business operations. The Company is working closely with its manufacturing partners and suppliers to help ensure the Company is able to source key components and maintain appropriate inventory levels to meet customer demand.

Company and Nature of Business

9 Months Ended

Sep. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Note 1. Company and Nature of Business

Description of Business

Sight Sciences, Inc. (the “Company”) was incorporated in the State of Delaware in 2010. The Company is located and headquartered in Menlo Park, California and has its principal commercial offices in Southlake, Texas. The Company is an ophthalmic medical device company focused on the development and commercialization of surgical and nonsurgical technologies for the treatment of prevalent eye diseases. The Company’s surgical glaucoma product portfolio features the OMNI® Surgical System, a device that facilitates the performance of both trabeculotomy and canaloplasty with a single device and single corneal incision. The Company’s nonsurgical dry eye product portfolio consists of the TearCare® System ("TearCare") for ophthalmologists and optometrists. TearCare is a wearable eyelid technology that delivers highly targeted and adjustable heat to the meibomian glands of the eyelids.

Stock Split

On July 7, 2021 the Company effected a 2-for-1 stock split of its issued and outstanding shares of common stock and a proportional adjustment to the existing conversion ratios for each series of the Company’s redeemable convertible preferred stock. Accordingly, all share and per share amounts for all periods presented in the accompanying condensed consolidated financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect this stock split and adjustment of the redeemable convertible preferred stock conversion ratios.

Initial Public Offering

On July 19, 2021, the Company closed its initial public offering (“IPO”) of its common stock in which the Company issued and sold 10,000,000 shares of its common stock, and sold an additional 1,500,000 shares of common stock upon the full exercise of the underwriters’ option to purchase additional shares of the Company's common stock. These sales occurred at the initial public offering price of $24.00 per share. The Company received net proceeds of approximately $252.2 million from the IPO, after deducting underwriting discounts and commissions of $19.3 million and offering costs of $4.5 million, of which $0.4 million were incurred as of December 31, 2020.

Immediately prior to the closing of the IPO, all then-outstanding shares of redeemable convertible preferred stock were converted into 25,534,404 shares of common stock. Further, all outstanding redeemable convertible preferred stock warrants were converted into warrants to purchase 659,028 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 July 2021, the Company’s certificate of incorporation was amended and restated to provide for 200,000,000 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.

Significant Risks and Uncertainties

Since inception, the Company has incurred losses and negative cash flows from operations. As of September 30, 2021, the Company had an accumulated deficit of $137.1 million and recorded a net loss of $47.0 million for the nine months then ended and expects to incur future additional losses. If the Company’s revenue levels from its products are not sufficient or if the Company is unable to secure additional funding when desired, the Company may need to delay the development of its products and scale back its business and operations.

The Company believes that its existing sources of liquidity will satisfy its working capital and capital requirements for at least 12 months from the issuance of its financial statements. Failure to generate sufficient revenues, achieve planned gross margins, or control operating costs will require the Company to raise additional capital through equity or debt financing. Such additional financing may not be available on acceptable terms, or at

all, and could require the Company to modify, delay, or abandon some of its planned future expansion or expenditures or reduce some of its ongoing operating costs, which could harm its business, operating results, financial condition, and ability to achieve its intended business objectives.

On March 11, 2020, the World Health Organization declared the coronavirus disease 2019 (“COVID-19”) outbreak a global pandemic recommending containment measures worldwide. On March 16, 2020 the Company implemented alternative work arrangements for its employees and limited its employees’ travel activities to protect its employees and to comply with the provisions described within the local shelter in place order. Certain U.S. federal, state and local governmental authorities issued other orders and directives, including restrictions on elective procedures and therapies, aimed at minimizing the spread of COVID-19. As such, the COVID-19 pandemic impacted and is expected to continue to impact demand for the Company’s products, which are used in procedures and therapies that are considered elective. Although some of the governmental restrictions have since been lifted or scaled back, recent and future surges of COVID-19, including recent surges in the delta variant of COVID-19, may result in restrictions being re-implemented in response to efforts to reduce the spread of COVID-19.

The ultimate impact of the COVID-19 pandemic on the Company’s operations is unknown and will depend on future developments which are highly uncertain and cannot be predicted with confidence, including the duration and severity of the COVID-19 outbreak (including prevalence and effect of the delta variant and other potential COVID-19 variants), the status of health and safety actions taken to contain its spread and any additional preventative and protective actions that governments or the Company may direct, any resurgence of COVID-19 that may occur and how quickly and to what extent economic and operating conditions normalize within the markets in which the Company operates. The COVID-19 pandemic could disrupt the operations of the Company’s third-party manufacturers and other suppliers. Although the Company has not experienced material disruptions in its supply chain to date, it cannot predict how long the pandemic and measures intended to contain the spread of COVID-19 will continue and what effect COVID-19 and the associated containment measures will have on our suppliers and vendors, in particular for any of the Company’s suppliers and vendors that may not qualify as essential businesses and suffer more significant disruptions to their business operations. The Company is working closely with its manufacturing partners and suppliers to help ensure the Company is able to source key components and maintain appropriate inventory levels to meet customer demand.