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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]  
Schedule of Carrying Value and Fair Value of Assets and Liabilities The following table shows assets and liabilities that are measured at fair value on a recurring basis and their carrying value (in millions):
As of June 30, 2020
Fair Value
Carrying ValueLevel 1Level 2Level 3
Cash and cash equivalents$641.9  $641.9  $—  $—  

As of December 31, 2019
Fair Value
Carrying ValueLevel 1Level 2Level 3
Cash and cash equivalents$487.4  $487.4  $—  $—  
Reconciliation of the Weighted Average Number of Shares Used to Compute Basic and Diluted Net Loss per Share
The following table sets forth the reconciliation of the weighted average number of common shares used to compute basic and diluted net loss per share for the three and six months ended June 30, 2020 and 2019:
 
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
 (in thousands, except per share amounts)
Numerator:    
Net loss$(61,854) $(66,514) $(128,218) $(140,667) 
Denominator:    
Weighted average common shares used in calculation of basic net loss per share:96,633  81,806  93,206  79,685  
Effect of dilutive securities:    
Common stock options—  —  —  —  
Restricted stock and RSUs—  —  —  —  
Convertible debt securities—  —  —  —  
Weighted average common shares outstanding used in calculation of diluted net loss per share96,633  81,806  93,206  79,685  
Net loss per share:    
Basic and diluted$(0.64) $(0.81) $(1.38) $(1.77) 
Potentially Dilutive Securities Excluded from Computations of Diluted Weighted Average Common Shares Outstanding
The following potentially dilutive securities have been excluded from the computations of diluted weighted average common shares outstanding as of June 30, 2020 and 2019 as their effect would have been anti-dilutive (in thousands):
 
As of June 30,
 20202019
Common stock options13,272  11,034  
Unvested restricted stock and RSUs868  475  
Convertible debt securities11,492  11,492  
Schedules of Concentration of Risk, by Risk Factor The following table presents the percentage of gross product revenue represented by the Company's three largest customers as of the six months ended June 30, 2020 and June 30, 2019.
Percentage of Total Gross Product Revenue
June 30, 2020June 30, 2019
Customer A28%31%
Customer B26%18%
Customer C24%30%