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Net Loss Per Share (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2011, 2012 and 2013:

		Year Ended December 31,
		2011				2012				2013
Numerator:
Net loss		$	(13,157	)		$	(13,880	)		$	(14,027	)
Accretion of redeemable convertible preferred stock to redemption value			(53	)			(67	)			(213	)
Net loss attributable to common stockholders		$	(13,210	)		$	(13,947	)		$	(14,240	)
Denominator:
Weighted average common shares outstanding, basic and diluted			688,946				709,678				729,001
Net loss per share attributable to common stockholders, basic and diluted		$	(19.17	)		$	(19.65	)		$	(19.53	)

Summary of Common Stock Equivalents Outstanding

The following common stock equivalents, outstanding as of September 30, 2014 and 2013, were excluded from the computation of diluted net loss per share for the nine months ended September 30, 2014 and 2013 because they had an anti-dilutive impact:

		As of September 30,
		2014				2013
Options to purchase common stock			1,839,895				1,283,264
Redeemable convertible preferred stock			—				78,372,931
Total options and redeemable convertible preferred stock exercisable or convertible into common stock			1,839,895				79,656,195

The Company excluded the following common stock equivalents, outstanding as of December 31, 2011, 2012 and 2013, from the computation of diluted net loss per share attributable to common stockholders for the years ended December 31, 2011, 2012 and 2013 because they had an anti-dilutive impact due to the net loss attributable to common stockholders incurred for the periods.

		December 31,
		2011				2012				2013
Stock options to purchase common stock			916,094				591,427				1,310,330
Unvested restricted common stock			24,548				10,615				—
			940,642				602,042				1,310,330

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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