Basis of Presentation and significant accounting policies (Policies)

3 Months Ended

Mar. 31, 2014

Basis of Presentation and significant accounting policies

Principles of consolidation

Principles of consolidation

The condensed consolidated financial statements include the accounts of OvaScience and the accounts of our wholly-owned subsidiary, OvaScience Securities Corporation. All intercompany transactions have been eliminated in consolidation.

Use of estimates

Use of estimates

These condensed consolidated financial statements are presented in conformity with U.S. generally accepted accounting principles which require management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from such estimates.

Net loss per share

Net loss per share

Basic and diluted net loss per common share is calculated by dividing net loss applicable to common stockholders by the weighted average number of common shares outstanding during the period. Potentially dilutive shares, including preferred stock, outstanding stock options and unvested restricted stock, are only included in the calculation of diluted net loss per share when their effect is dilutive.

The amounts in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in thousands):

			Period
			from April 5,
			2011
	Three Months Ended		(inception) to
	March 31,		March 31,
	2014	2013	2014
Outstanding stock options and restricted stock units	2,225	2,664	2,225
Unvested founders’ stock	823	1,645	823
Total	3,048	4,309	3,048