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Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows (in thousands, except share and per share data):

			Year ended
			December 31, 2017												December 31, 2016												December 31, 2015
			Class A						Class B						Class A						Class B						Class A						Class B
Numerator
Net loss			$	(33,016)					$	(11,410)					$	(31,644)					$	(12,333)					$	(30,075)					$	(13,324)
Denominator
Weighted-average common shares outstanding - basic and diluted			30,929,899						10,688,939						29,265,605						11,405,528						27,617,350						12,235,274
Basic and diluted net loss per share			$	(1.07)					$	(1.07)					$	(1.08)					$	(1.08)					$	(1.09)					$	(1.09)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows:

			As of December 31,
			2017						2016						2015
Shares subject to outstanding common stock options			8,145,777						7,532,455						6,969,133
Shares subject to unvested restricted stock awards			163,332						353,335						600,025
Shares issuable pursuant to the ESPP			85,509						—						—

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- References

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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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