Organization	9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization OvaScience, Inc., incorporated on April 5, 2011 as a Delaware corporation, is a global fertility company developing proprietary potential treatments for female fertility based on scientific discoveries about the existence of egg precursor, or EggPC^SM, cells. As used in these condensed consolidated financial statements, the terms “OvaScience,” “the Company,” “we,” “us,” and “our” refer to the business of OvaScience, Inc. and its wholly owned subsidiaries. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring and developing our technology, identifying potential fertility treatments, developing the OvaPrime^SM treatment, the OvaTure^SMtreatment and the AUGMENT^SM treatment, introducing the AUGMENT treatment in select international in vitro fertilization ("IVF") clinics and determining the regulatory and development path for our fertility treatments. We have generated limited revenues to date, and do not anticipate significant revenues in the near term. On June 21, 2017, we announced that we will continue to focus on advancing OvaPrime in clinical development and OvaTure in preclinical development and will discontinue ongoing efforts related to the AUGMENT treatment outside of North America. To better align our organization with these strategic priorities, we restructured our workforce and reduced our workforce by approximately 50%. We are subject to a number of risks similar to other life science companies, including, but not limited to, the need to obtain adequate additional funding, risks associated with clinical and preclinical development, the need to develop and obtain marketing approval for certain of our fertility treatments, competitors developing new technological innovations, the need to successfully commercialize and gain market acceptance of our fertility treatments and protection of proprietary technology. If we do not successfully develop and commercialize any of our fertility treatments, we will be unable to generate treatment revenue or achieve profitability. As of September 30, 2017, we had an accumulated deficit of approximately $293.0 million. Liquidity We have incurred annual net operating losses in each year since our inception. We have generated limited treatment revenues related to our primary business purpose and have financed our operations primarily through public sales of our common stock and private placements of our preferred stock, which was subsequently converted to common stock. We have devoted substantially all of our financial resources and efforts to the research and development of our OvaPrime and OvaTure fertility treatments and the introduction of the AUGMENT treatment in select international IVF clinics. We expect to continue to incur significant expenses related to the research and development of OvaPrime and OvaTure and incur operating losses for the next several years. We expect that our existing cash, cash equivalents and short-term investments of $75.7 million at September 30, 2017, will be sufficient to fund our current operating plan for at least the next 12 months from the date of filing this Form 10-Q. There can be no assurances, however, that the current operating plan will be achieved or that additional funding, if needed, will be available on terms acceptable to us, or at all.

Organization

OvaScience, Inc., incorporated on April 5, 2011 as a Delaware corporation, is a global fertility company developing proprietary potential treatments for female fertility based on scientific discoveries about the existence of egg precursor, or EggPC^SM, cells. As used in these condensed consolidated financial statements, the terms “OvaScience,” “the Company,” “we,” “us,” and “our” refer to the business of OvaScience, Inc. and its wholly owned subsidiaries. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring and developing our technology, identifying potential fertility treatments, developing the OvaPrime^SM treatment, the OvaTure^SMtreatment and the AUGMENT^SM treatment, introducing the AUGMENT treatment in select international in vitro fertilization ("IVF") clinics and determining the regulatory and development path for our fertility treatments. We have generated limited revenues to date, and do not anticipate significant revenues in the near term. On June 21, 2017, we announced that we will continue to focus on advancing OvaPrime in clinical development and OvaTure in preclinical development and will discontinue ongoing efforts related to the AUGMENT treatment outside of North America. To better align our organization with these strategic priorities, we restructured our workforce and reduced our workforce by approximately 50%.

We are subject to a number of risks similar to other life science companies, including, but not limited to, the need to obtain adequate additional funding, risks associated with clinical and preclinical development, the need to develop and obtain marketing approval for certain of our fertility treatments, competitors developing new technological innovations, the need to successfully commercialize and gain market acceptance of our fertility treatments and protection of proprietary technology. If we do not successfully develop and commercialize any of our fertility treatments, we will be unable to generate treatment revenue or achieve profitability. As of September 30, 2017, we had an accumulated deficit of approximately $293.0 million.

Liquidity

We have incurred annual net operating losses in each year since our inception. We have generated limited treatment revenues related to our primary business purpose and have financed our operations primarily through public sales of our common stock and private placements of our preferred stock, which was subsequently converted to common stock.

We have devoted substantially all of our financial resources and efforts to the research and development of our OvaPrime and OvaTure fertility treatments and the introduction of the AUGMENT treatment in select international IVF clinics. We expect to continue to incur significant expenses related to the research and development of OvaPrime and OvaTure and incur operating losses for the next several years.

We expect that our existing cash, cash equivalents and short-term investments of $75.7 million at September 30, 2017, will be sufficient to fund our current operating plan for at least the next 12 months from the date of filing this Form 10-Q. There can be no assurances, however, that the current operating plan will be achieved or that additional funding, if needed, will be available on terms acceptable to us, or at all.