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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Accounting Policies [Abstract]  
Anti-Dilutive Effect of Common Shares

The table below presents shares underlying stock options, restricted stock units, and employee stock purchase plan rights that were excluded from the calculation of the weighted average number of shares outstanding used for the calculation of diluted net loss per share. These are excluded from the calculation due to their anti-dilutive effect for the three months ended March 31, 2017 and 2016 (shares in thousands):

 

 

 

Three Months Ended

 

 

 

March 31,

 

 

 

2017

 

 

2016

 

Weighted average number of anti-dilutive potential shares:

 

 

 

 

 

 

 

 

Stock options

 

 

16,669

 

 

 

14,770

 

Restricted stock units

 

 

966

 

 

 

216

 

Employee stock purchase plan rights

 

 

40

 

 

 

36

 

Total

 

 

17,675

 

 

 

15,022