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Organization and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Outstanding anti-dilutive securities not included in diluted net loss per share
Outstanding anti-dilutive securities not included in the diluted net loss per share attributable to common stockholders calculations were as follows:
 
Three Months Ended 
 March 31,
 (In millions)
2019
 
2018
Options outstanding to purchase common stock

 
0.4

Unvested restricted stock units
2.3

 
3.1

Senior convertible notes due 2022
4.0

 
4.0

Senior convertible notes due 2023
5.2

 

Warrants
5.2

 

Total
16.7

 
7.5