Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Stock based compensation expenses by award type (Details)

v3.21.2
Stock Based Compensation - Stock based compensation expenses by award type (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-based Payment Arrangement, Expense $ 2,396 $ 403 $ 4,013 $ 525  
Options to purchase common stock          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-based Payment Arrangement, Expense 128 $ 403 595 $ 525 $ 100
Earn Out Shares          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-based Payment Arrangement, Expense 1,970   1,970    
Warrants to purchase common stock          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-based Payment Arrangement, Expense 39   1,043    
Unvested restricted stock units          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-based Payment Arrangement, Expense $ 259   $ 405