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Fair Value Measurements - Schedule of fair value on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Liabilities:    
Warrant liabilities, non-current $ 4,961 $ 15,389
Recurring    
Liabilities:    
Total 4,961,000 15,389
Recurring | Level 2 | 5-Year Private Warrants    
Liabilities:    
Warrant liabilities, non-current 4,936,000 15,327
Recurring | Level 2 | Seller Warrants    
Liabilities:    
Warrant liabilities, non-current $ 25,000 $ 62