Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Stock-based compensation (Details)

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Summary of Significant Accounting Policies - Stock-based compensation (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2020
Mar. 31, 2020
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted           6,474,175    
Stock compensation expense     $ 2,396   $ 403 $ 4,013 $ 525  
Earn-out shares issuable upon achieving certain milestones           15,000,000    
Options to purchase common stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted       2,554,015        
Stock compensation expense     128   $ 403 $ 595 $ 525 $ 100
Business development agreement term   3 years            
Options to purchase common stock | Officer                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted 560,189              
Subscription Agreements                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock compensation expense     $ 2,000     $ 2,000    
Earn-out shares issuable upon achieving certain milestones           15,000,000    
Earn-out shares are subject to the share-based compensation           2,862,603