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Net Loss Per Share (Antidilutive Shares Excluded From Computation Of Diluted Net Loss Per Share) (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Shares issuable upon conversion of convertible senior notes [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 20,690 20,690 20,690 20,690
Warrants to purchase common stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 15,537 2,326 15,537 12,703
RSUs [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 8,670 2,006 8,670 6,835
ESPP [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 3,880 126 3,880 1,564