Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Restricted shares activity (Details)

v3.21.1
Stock-based Compensation - Restricted shares activity (Details) - Restricted common shares
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Shares    
Nonvested at December 31, 2019 | shares 18,335  
Granted | shares 8,657  
Vested | shares (5,468)  
Repurchased | shares (5,413)  
Nonvested at December 31, 2020 | shares 16,111 18,335
Weighted-Average Grant-Date Fair Value    
Nonvested at December 31, 2019 (in dollars per share) | $ / shares $ 0.20  
Granted (in dollars per share) | $ / shares 10.67 $ 0.20
Vested (in dollars per share) | $ / shares 9.65  
Repurchased (in dollars per share) | $ / shares 0.19  
Nonvested at December 31, 2020 (in dollars per share) | $ / shares $ 9.19 $ 0.20
Total fair value of shares granted $ 92.4 $ 1.8
Share-based compensation expense 83.4 1.5
Unrecognized compensation cost 116.9  
Unrecognized compensation cost, portion recognized in 2021 92.3  
Unrecognized compensation cost, portion recognized in 2022 20.5  
Unrecognized compensation cost, portion recognized in 2023 3.7  
Unrecognized compensation cost, portion recognized in 2024 0.4  
Research and development expense    
Weighted-Average Grant-Date Fair Value    
Share-based compensation expense 58.7 0.6
Selling, General and Administrative Expenses [Member]    
Weighted-Average Grant-Date Fair Value    
Share-based compensation expense $ 24.7 $ 0.9