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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Jul. 21, 2021
Jan. 27, 2021
Sep. 30, 2021
Jul. 31, 2021
Dec. 31, 2020
Feb. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards outstanding (in shares) 42,193,512          
Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amount available for future issuance (in shares)     49,573,570      
Percent threshold of common stock issued and outstanding for annual increase of shares available for issue       5.00%    
Awards outstanding (in shares)     0      
Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards outstanding (in shares)     32,137,760   30,488,300  
Number of shares authorized for grant (in shares)           42,390,000
Total remaining stock-based compensation expense     $ 14,970      
Granted (in shares)     5,287,031      
Granted (in dollars per share)     $ 4.74      
Equity Incentive Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average period for expense to be recognized     3 years 1 month 2 days      
Equity Incentive Plan | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total remaining stock-based compensation expense     $ 3,997      
STI Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards outstanding (in shares)     9,529,482   6,490,208  
Number of shares authorized for grant (in shares)     14,130,000      
Total remaining stock-based compensation expense     $ 7,860      
Granted (in shares)   399,553 5,516,399      
Granted (in dollars per share)   $ 2.767 $ 7.82      
Accrued outstanding rent payments   $ 947        
STI Plan | Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average period for expense to be recognized     4 years 25 days      
Deferred Salary And Bonuses Settlement | Restricted stock awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock issued from awards (in shares) 1,404,459          
Purchase price (in dollars per share) $ 13.78          
Restricted stock vesting period 90 days          
Cancellation of restricted stock awards (in shares)     40,441