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Net Loss Per Share (Antidilutive Shares Excluded From Computation Of Diluted Net Loss Per Share) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 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 15,602 12,335 15,602 12,335
RSUs [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 8,392 6,820 8,392 6,820
ESPP [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from the computation of earnings per share 1,931 2,336 1,931 2,336