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Share-based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 28, 2018
$ / shares
shares
Apr. 30, 2021
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
group
$ / shares
shares
Dec. 31, 2017
$ / shares
Jan. 27, 2014
shares
Jan. 17, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Aggregate intrinsic value of option exercised | $             $ 0 $ 0 $ 0      
Estimated fair value per option vested (in dollars per share) | $ / shares             $ 0.66 $ 0.36 $ 0.32      
Fair value, nonvested (in dollars per share) | $ / shares     $ 1.91   $ 1.91   $ 0.34 $ 0.34 $ 0.34 $ 0.55    
Granted (in shares)         3,730,717   830,194 3,202,435 14,202,635      
Share based payment expense | $     $ 25,800 $ 121 $ 228,461 $ 363            
Options, cost not yet recognized | $             $ 800 $ 1,200 $ 1,100      
Common stock, shares issued (in usd per share)     106,234,792   106,234,792   95,985,817 95,931,549        
Employee Stock Purchase Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares authorized   10,278,581                    
Award percentage of total common stock issued and outstanding (up to)   1.00%                    
Common stock, shares issued (in usd per share)   1,027,858                    
Options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares authorized 18,985,846                   4,229,850 4,229,850
Share based payment expense | $             $ 500 $ 200 $ 1,900      
Options | PH Group Option Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration period             10 years          
Options | Time-Based                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Awards granted, percent             14.00% 27.00% 27.00%      
Vested percent             1.00% 17.00% 50.00%      
Unvested percent             99.00% 83.00% 50.00%      
Estimated fair value per option vested (in dollars per share) | $ / shares $ 0.32           $ 0.40 $ 0.36        
Fair value, nonvested (in dollars per share) | $ / shares $ 0.32           $ 0.40 $ 0.36        
Granted (in shares)               3,202,435 14,202,635      
Awards cancelled and subsequently reissued               227,600 2,087,359      
Number of employees whose shares were cancelled and subsequently reissued | group                 22      
Options | Time-Based | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award requisite service period             4 years 4 years 4 years      
Options | Time-Based | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award requisite service period               0 years 0 years      
Options | Performance-Based                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Awards granted, percent             86.00% 73.00% 73.00%