XML 25 R10.htm IDEA: XBRL DOCUMENT
v3.20.2

Organization and Principal Activities | 9 Months Ended
--- | ---
Sep. 30, 2020
Disclosure Text Block [Abstract] |
Organization and Principal Activities | 1. Organization and Principal Activities Description of Business Sutro Biopharma, Inc. (the “Company”), is a clinical stage drug discovery, development and manufacturing company focused on deploying its proprietary integrated cell-free protein synthesis platform, XpressCF®, to create a broad variety of optimally designed, next-generation protein therapeutics initially for cancer and autoimmune disorders. The Company was incorporated on April 21, 2003 and is headquartered in South San Francisco, California. The Company operates in one business segment, the development of biopharmaceutical products. At-The-Market Sales During the three months ended September 30, 2020, the Company sold an aggregate of 2,000,000 shares of its common stock through its At-the-Market (“ATM Facility”) pursuant to its Common Stock Sales Agreement dated October 4, 2019 with Cowen and Company, LLC, as sales agent. The gross proceeds from these sales were approximately $17.4 million, before deducting fees of approximately $0.6 million, resulting in net proceeds of approximately $16.8 million to the Company. May 2020 Public Offering On May 14, 2020, the Company closed a public offering of 12,650,000 shares of its common stock at a public offering price of $7.75 per share, which included the exercise in full of the underwriters’ option to purchase 1,650,000 shares of common stock. The gross proceeds from this offering were approximately $98.0 million, before deducting approximately $6.6 million of underwriting discounts and commissions and other offering expenses, resulting in net proceeds of approximately $91.4 million to the Company. Liquidity The Company has incurred significant losses and has negative cash flows from operations. As of September 30, 2020, the Company had an accumulated deficit of $168.3 million. Management expects to incur additional substantial losses in the foreseeable future as a result of the Company’s research and development activities and costs to operate as a public company. As of September 30, 2020, the Company had unrestricted cash, cash equivalents and marketable securities of $202.4 million, which are available to fund future operations. The Company believes that its unrestricted cash, cash equivalents and marketable securities as of September 30, 2020 will be sufficient for the Company to continue for at least one year from the issuance date of its unaudited interim condensed financial statements. The Company will need to raise additional capital to support the completion of its research and development activities and its operations.

X
- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
Name: | us-gaap_NatureOfOperations
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration