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Earnings Per Common Share ("EPS") - Potential Dilutive Securities Outstanding that are Considered Antidilutive (Detail) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 70,472,100,000 38,800,556,000
Common Stock Options and PNQs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 11,321,734,000 14,014,315,000
RSUs and Market RSUs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 6,282,279,000 522,021,000
Employee Stock Purchase Plan    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 94,157,000 144,088,000
Senior Convertible Notes    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 44,120,463,000  
Mann Group Convertible Notes    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 7,370,000,000 14,000,000,000
Convertible Note    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share   1,666,667,000
Warrants Associated with MidCap Credit Facility    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 1,283,467,000 1,171,614,000
Warrants Associated with Public Offering    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share   7,250,000,000
Common Stock Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share   31,851,000