Nature of Operations	9 Months Ended
Sep. 30, 2013
Nature of Operations	1. Nature of Operations KaloBios Pharmaceuticals, Inc. (the Company) is a biopharmaceutical company whose primary business is to develop monoclonal antibody therapeutics for diseases that represent a significant burden to society and to patients and their families. The Company’s primary clinical focus is on respiratory diseases and cancer. All of the Company’s assets are located in California. The Company has incurred significant losses and had an accumulated deficit of $130.0 million as of September 30, 2013. The Company has financed its operations primarily through the sale of equity securities, debt financing, grants and the payments received under its agreements with Novartis Pharma AG (Novartis) and Sanofi Pasteur S.A. (Sanofi). 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. As a result, the Company will continue to seek additional capital through equity offerings, debt financing and/or payments under new or existing licensing or collaboration agreements. If sufficient funds on acceptable terms are not available when needed, the Company could be required to significantly reduce its operating expenses and delay, reduce the scope of, or eliminate one or more of its development programs. Initial Public Offering and October Offering of Common Stock The Company closed its initial public offering (IPO) in February 2013, selling 8,750,000 shares of common stock. The IPO price was $8.00 per share. As a result of the IPO, the Company received gross proceeds of approximately $70.0 million, which resulted in net proceeds to the Company of approximately $61.5 million, after underwriting and other expenses of approximately $8.5 million (comprised of $4.9 million in underwriting discounts and commissions and $3.6 million in other offering expenses). In addition, in connection with the completion of the Company’s IPO, all outstanding convertible preferred stock converted into 13,211,120 shares of common stock. The Company closed an equity public offering in October, 2013, selling 8,625,000 shares of common stock. The offering price was $4.00 per share. As a result of the offering , the Company received gross proceeds of $34.5 million, including the exercise of the overallotment option by the Underwriters, which resulted in net proceeds of approximately $32.0 million, after underwriting and other expenses of approximately $2.5 million (comprised of $2.1 million in underwriting discounts and commissions and $0.4 million in other expenses).

1. Nature of Operations

KaloBios Pharmaceuticals, Inc. (the Company) is a biopharmaceutical company whose primary business is to develop monoclonal antibody therapeutics for diseases that represent a significant burden to society and to patients and their families. The Company’s primary clinical focus is on respiratory diseases and cancer. All of the Company’s assets are located in California.

The Company has incurred significant losses and had an accumulated deficit of $130.0 million as of September 30, 2013. The Company has financed its operations primarily through the sale of equity securities, debt financing, grants and the payments received under its agreements with Novartis Pharma AG (Novartis) and Sanofi Pasteur S.A. (Sanofi). 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. As a result, the Company will continue to seek additional capital through equity offerings, debt financing and/or payments under new or existing licensing or collaboration agreements. If sufficient funds on acceptable terms are not available when needed, the Company could be required to significantly reduce its operating expenses and delay, reduce the scope of, or eliminate one or more of its development programs.

Initial Public Offering and October Offering of Common Stock

The Company closed its initial public offering (IPO) in February 2013, selling 8,750,000 shares of common stock. The IPO price was $8.00 per share. As a result of the IPO, the Company received gross proceeds of approximately $70.0 million, which resulted in net proceeds to the Company of approximately $61.5 million, after underwriting and other expenses of approximately $8.5 million (comprised of $4.9 million in underwriting discounts and commissions and $3.6 million in other offering expenses). In addition, in connection with the completion of the Company’s IPO, all outstanding convertible preferred stock converted into 13,211,120 shares of common stock.

The Company closed an equity public offering in October, 2013, selling 8,625,000 shares of common stock. The offering price was $4.00 per share. As a result of the offering , the Company received gross proceeds of $34.5 million, including the exercise of the overallotment option by the Underwriters, which resulted in net proceeds of approximately $32.0 million, after underwriting and other expenses of approximately $2.5 million (comprised of $2.1 million in underwriting discounts and commissions and $0.4 million in other expenses).