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Common Shares Reserved for Issuance (Tables)
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Schedule of Reserved Shares of Common Stock for Issuance
We had reserved shares of common stock for issuance as follows (in thousands):
 
As of September 30, 2020
 
As of December 31, 2019
Reserved under stock award plans
40,148

 
37,982

Convertible senior notes
33,856

 
35,442

Employee Stock Purchase Plan (ESPP)
4,316

 
3,428

Total
78,320

 
76,852