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

Net Loss per Share - Summary of Dilutive Securities are Excluded from the Denominator (Detail)

v3.21.2
Net Loss per Share - Summary of Dilutive Securities are Excluded from the Denominator (Detail) - shares
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 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 127,325,149 121,335,436 132,777,115 126,687,074
Convertible preferred stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 113,083,557 112,914,163 112,987,810 112,840,517
Unvested awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 14,241,592 8,231,273 19,599,305 13,656,557
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   190,000 190,000 190,000