The Company	6 Months Ended
Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company	1. The Company Kodiak Sciences Inc. (the “Company”) is a clinical-stage biopharmaceutical company specializing in novel therapeutics to treat high-prevalence ophthalmic diseases. The Company devotes substantially all of its time and efforts to performing research and development, raising capital and recruiting personnel. Liquidity In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. The Company has incurred significant losses and negative cash flows from operations since inception and had an accumulated deficit of $130.1 million as of June 30, 2019. The Company had $68.1 million in cash and cash equivalents and marketable securities as of June 30, 2019. The Company has historically financed its operations primarily through the sale of redeemable convertible preferred stock, convertible notes, warrants and the sale of common stock in its initial public offering (“IPO”). To date, none of the Company’s product candidates have been approved for sale and therefore, the Company has not generated any revenue from product sales. Management expects operating losses to continue for the foreseeable future. The Company currently plans to raise additional funding as required based on the status of its development programs and projected cash flows, and the Company believes that its cash and cash equivalents and marketable securities as of June 30, 2019 are sufficient to fund its existing operational commitments and objectives at least through the first half of 2020. If the Company is unable to obtain other financing, the Company would be forced to delay, reduce or terminate some or all of its development programs and clinical trials or sell or license rights to its product candidates in certain territories or indications to others that may not be favorable to the Company. The uncertainties inherent in the Company’s future operations and in its ability to obtain additional funding raise substantial doubt about its ability to continue as a going concern beyond one year from the date these financial statements are issued. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

The Company

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. The Company

Kodiak Sciences Inc. (the “Company”) is a clinical-stage biopharmaceutical company specializing in novel therapeutics to treat high-prevalence ophthalmic diseases. The Company devotes substantially all of its time and efforts to performing research and development, raising capital and recruiting personnel.

Liquidity

In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. The Company has incurred significant losses and negative cash flows from operations since inception and had an accumulated deficit of $130.1 million as of June 30, 2019. The Company had $68.1 million in cash and cash equivalents and marketable securities as of June 30, 2019. The Company has historically financed its operations primarily through the sale of redeemable convertible preferred stock, convertible notes, warrants and the sale of common stock in its initial public offering (“IPO”). To date, none of the Company’s product candidates have been approved for sale and therefore, the Company has not generated any revenue from product sales. Management expects operating losses to continue for the foreseeable future. The Company currently plans to raise additional funding as required based on the status of its development programs and projected cash flows, and the Company believes that its cash and cash equivalents and marketable securities as of June 30, 2019 are sufficient to fund its existing operational commitments and objectives at least through the first half of 2020. If the Company is unable to obtain other financing, the Company would be forced to delay, reduce or terminate some or all of its development programs and clinical trials or sell or license rights to its product candidates in certain territories or indications to others that may not be favorable to the Company.

The uncertainties inherent in the Company’s future operations and in its ability to obtain additional funding raise substantial doubt about its ability to continue as a going concern beyond one year from the date these financial statements are issued. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.