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Common Shares Reserved for Issuance (Tables)
12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of Reserved Shares of Common stock for Issuance
As of December 31, 2015 and 2014, we had reserved shares of common stock for issuance as follows (in thousands):
 
 
As of December 31,
 
 
2015
 
2014
Reserved under stock award plans
 
38,500

 
38,879

Convertible Senior Notes
 
15,141

 

ESPP
 
3,214

 
2,683

Total
 
56,855

 
41,562