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Document and Entity Information	6 Months Ended
	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	OvaScience, Inc.
Entity Central Index Key	0001544227
Document Type	S-4
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Entity Filer Category	Accelerated Filer

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other".

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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