Basic and Diluted Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Common Equivalent Shares were Excluded From Diluted Net Loss Per Share Calculation because their Inclusion would have been Anti-Dilutive

The following common equivalent shares were excluded from the diluted net loss per share calculation because their inclusion would have been anti-dilutive:

	Year Ended December 31,
	2018		2017		2016
Stock options		1,746,073		2,440,290		1,884,425
Shares to be issued under ESPP		22,683		44,320		83,790
Restricted stock units		793,518		784,000		—
Convertible senior notes		3,411,199		3,411,199		—
Total		5,973,473		6,679,809		1,968,215

Schedule of Common Stock Reserved

The amount of such shares of the Company’s common stock reserved for these purposes at December 31, 2018 is as follows:  

	Number of Shares
Stock options issued and outstanding		1,746,073
Additional shares available for grant under equity plans		1,808,539
Total		3,554,612