General form of registration statement for all companies including face-amount certificate companies

Net Loss Per Share Attributable to Common Stockholders - Summary Of Outstanding Securities Were Excluded From The Computation Of Diluted Net Loss Per Share (Detail)

v3.21.2
Net Loss Per Share Attributable to Common Stockholders - Summary Of Outstanding Securities Were Excluded From The Computation Of Diluted Net Loss Per Share (Detail) - Bird Rides [Member] - shares
shares in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 211,958 185,666 185,078 171,266
Redeemable convertible preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   153,739 153,739 135,024
Redeemable convertible senior preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 29,234      
Redeemable convertible prime preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 149,446      
Exchanged common stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 4,293      
Founders Convertible Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 4,540 4,540 4,540 4,540
Unvested common stock shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 589 9,121 4,584 13,461
Stock options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 14,755 18,198 19,242 17,615
Restricted stock units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 5,825      
Early Exercises of Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount     2,866 316
Warrants to purchase redeemable convertible preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   68    
Warrants to purchase redeemable convertible prime preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 68   107 310
Warrants to purchase redeemable convertible senior preferred stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 3,208