Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Description of Business OXiGENE, Inc. (the “Company”), is incorporated in the state of Delaware, and is a clinical-stage, biopharmaceutical company developing novel therapeutics primarily to treat cancer. The Company’s major focus is developing vascular disrupting agents (VDAs) that selectively disrupt abnormal blood vessels associated with solid tumor progression. The Company is dedicated to leveraging its intellectual property and therapeutic development expertise to bring life-extending and life-enhancing medicines to patients. The Company has two VDA drug candidates currently being tested in clinical trials, ZYBRESTAT^® (fosbretabulin tromethamine) and OXi4503. Basis of Presentation The accompanying unaudited condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. They have been prepared on a basis which assumes that OXiGENE, Inc. (“OXiGENE” or the “Company”) will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The financial statements do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, however, all adjustments (consisting primarily of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. The balance sheet at December 31, 2013 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the financial statements and footnotes thereto included in the Annual Report on Form 10-K for the Company for the year ended December 31, 2013. Capital Resources The Company has experienced net losses every year since inception and, as of March 31, 2014, had an accumulated deficit of approximately $241,138,000. The Company expects to incur significant additional operating losses over at least the next several years, principally as a result of the Company’s clinical trials and anticipated research and development expenditures. The principal source of the Company’s working capital to date has been the proceeds of private and public equity financings, the exercise of warrants and, to a lesser extent, the exercise of stock options. The Company currently has no recurring material amount of income. As of March 31, 2014, the Company had approximately $24,735,000 in cash. Based on the Company’s ongoing programs, planned new programs and operations, the Company expects its existing cash to support its operations through at least the end of 2015. Significant Accounting Policies *Use of Estimates* The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates. *Revenue Recognition* In December 2011, the Company established a distribution agreement to provide access to ZYBRESTAT^® (fosbretabulin tromethamine) for the treatment of patients with anaplastic thyroid cancer (ATC) in certain specified territories on a compassionate use basis. The agreement provides that upon the receipt of ZYBRESTAT^® (fosbretabulin tromethamine) by the distributor for distribution and sale to compassionate use patients, the distributor has 30 days to inspect the product for defects and to ensure that the product conforms to the warranties made by the Company. If the distributor does not notify the Company of any defective products within the 30-day period, it will be deemed to have accepted the products. Revenue is recognized based on products accepted at the conclusion of the 30-day inspection period. Also, the distributor will pay to the Company, on a quarterly basis, an amount equal to 20% of the distributor’s gross margin, as defined in the agreement, on its sales of ZYBRESTAT^® (fosbretabulin tromethamine) in the preceding quarter, less the cost of introductory drug provided at no cost. This revenue will be recognized upon notification from the distributor of the gross margin earned. ZYBRESTAT^® (fosbretabulin tromethamine) was expensed at the time it was manufactured, because it is in the development stage and there was not an alternative future use. As a result, the product provided to the distributor has a zero cost basis, and therefore no cost-of-goods-sold has been recorded.

1. Summary of Significant Accounting Policies

Description of Business

OXiGENE, Inc. (the “Company”), is incorporated in the state of Delaware, and is a clinical-stage, biopharmaceutical company developing novel therapeutics primarily to treat cancer. The Company’s major focus is developing vascular disrupting agents (VDAs) that selectively disrupt abnormal blood vessels associated with solid tumor progression. The Company is dedicated to leveraging its intellectual property and therapeutic development expertise to bring life-extending and life-enhancing medicines to patients. The Company has two VDA drug candidates currently being tested in clinical trials, ZYBRESTAT^® (fosbretabulin tromethamine) and OXi4503.

Basis of Presentation

The accompanying unaudited condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. They have been prepared on a basis which assumes that OXiGENE, Inc. (“OXiGENE” or the “Company”) will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The financial statements do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, however, all adjustments (consisting primarily of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014.

The balance sheet at December 31, 2013 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the financial statements and footnotes thereto included in the Annual Report on Form 10-K for the Company for the year ended December 31, 2013.

Capital Resources

The Company has experienced net losses every year since inception and, as of March 31, 2014, had an accumulated deficit of approximately $241,138,000. The Company expects to incur significant additional operating losses over at least the next several years, principally as a result of the Company’s clinical trials and anticipated research and development expenditures. The principal source of the Company’s working capital to date has been the proceeds of private and public equity financings, the exercise of warrants and, to a lesser extent, the exercise of stock options. The Company currently has no recurring material amount of income. As of March 31, 2014, the Company had approximately $24,735,000 in cash. Based on the Company’s ongoing programs, planned new programs and operations, the Company expects its existing cash to support its operations through at least the end of 2015.

Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates.

Revenue Recognition

In December 2011, the Company established a distribution agreement to provide access to ZYBRESTAT^® (fosbretabulin tromethamine) for the treatment of patients with anaplastic thyroid cancer (ATC) in certain specified territories on a compassionate use basis. The agreement provides that upon the receipt of ZYBRESTAT^® (fosbretabulin tromethamine) by the distributor for distribution and sale to compassionate use patients, the distributor has 30 days to inspect the product for defects and to ensure that the product conforms to the warranties made by the Company. If the distributor does not notify the Company of any defective products within the 30-day period, it will be deemed to have accepted the products. Revenue is recognized based on products accepted at the conclusion of the 30-day inspection period. Also, the distributor will pay to the Company, on a quarterly basis, an amount equal to 20% of the distributor’s gross margin, as defined in the agreement, on its sales of ZYBRESTAT^® (fosbretabulin tromethamine) in the preceding quarter, less the cost of introductory drug provided at no cost. This revenue will be recognized upon notification from the distributor of the gross margin earned. ZYBRESTAT^® (fosbretabulin tromethamine) was expensed at the time it was manufactured, because it is in the development stage and there was not an alternative future use. As a result, the product provided to the distributor has a zero cost basis, and therefore no cost-of-goods-sold has been recorded.