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Net Loss Per Share - Schedule of Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 55,810 39,035
Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 34,392 36,174
2025 Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 19,471 0
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 1,430 2,453
Performance based restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 325 0
ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 192 345
Restricted stock awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive securities excluded from computation of earnings per share, total (in shares) 0 63