Registration of securities issued in business combination transactions

FAIR VALUE MEASUREMENTS - Assets measured on recurring basis (Details)

v3.21.2
FAIR VALUE MEASUREMENTS - Assets measured on recurring basis (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Assets        
Total liabilities $ 6,558,000      
Level 1 to Level 2 transfer 0 $ 0 $ 0 $ 0
Level 2 to Level 1 transfer 0 0 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Movement in Level 3 liabilities measured at fair value        
Balance at beginning of period 93,328,000 $ 0 0  
Balance at end of period     93,328,000 0
Level 3        
Assets        
Total liabilities 6,558,000      
Movement in Level 3 assets measured at fair value        
Balance at beginning of year 3,000,000      
Additions 3,620,000   3,000,000  
Changes in fair value 517,000      
Balance at end of year 7,137,000   3,000,000  
Movement in Level 3 liabilities measured at fair value        
Balance at beginning of period 93,328,000      
Additions 6,558,000      
Changes in fair value 56,576,000      
Exercise of private placement warrants (149,904,000)      
Balance at end of period 6,558,000   93,328,000  
Recurring        
Assets        
Total assets 514,453,000   597,753,000 150,209,000
Total liabilities     93,328,000  
Recurring | Contingent Consideration        
Assets        
Total liabilities 6,084,000      
Recurring | Subscription Agreement        
Assets        
Total liabilities 474,000      
Recurring | Private Placement Warrants        
Assets        
Total liabilities     93,328,000  
Recurring | Money market funds        
Assets        
Total assets 180,998,000   407,512,000 40,454,000
Recurring | Commercial paper        
Assets        
Total assets 159,591,000   119,285,000 19,938,000
Recurring | Corporate bonds        
Assets        
Total assets 104,755,000   47,959,000 48,010,000
Recurring | Government bonds        
Assets        
Total assets 36,727,000      
Recurring | Assetbacked securities        
Assets        
Total assets 25,245,000     16,806,000
Recurring | Other investments        
Assets        
Total assets 7,137,000   3,000,000  
Recurring | U.S Treasury securities        
Assets        
Total assets     19,997,000  
Recurring | Repurchase agreements        
Assets        
Total assets       25,001,000
Recurring | Level 1        
Assets        
Total assets 180,998,000   427,509,000 40,454,000
Recurring | Level 1 | Money market funds        
Assets        
Total assets 180,998,000   407,512,000 40,454,000
Recurring | Level 1 | U.S Treasury securities        
Assets        
Total assets     19,997,000  
Recurring | Level 2        
Assets        
Total assets 326,318,000   167,244,000 109,755,000
Recurring | Level 2 | Commercial paper        
Assets        
Total assets 159,591,000   119,285,000 19,938,000
Recurring | Level 2 | Corporate bonds        
Assets        
Total assets 104,755,000   47,959,000 48,010,000
Recurring | Level 2 | Government bonds        
Assets        
Total assets 36,727,000      
Recurring | Level 2 | Assetbacked securities        
Assets        
Total assets 25,245,000     16,806,000
Recurring | Level 2 | Repurchase agreements        
Assets        
Total assets       $ 25,001,000
Recurring | Level 3        
Assets        
Total assets 7,137,000   3,000,000  
Total liabilities     93,328,000  
Recurring | Level 3 | Contingent Consideration        
Assets        
Total liabilities 6,084,000      
Recurring | Level 3 | Subscription Agreement        
Assets        
Total liabilities 474,000      
Recurring | Level 3 | Private Placement Warrants        
Assets        
Total liabilities     93,328,000  
Recurring | Level 3 | Other investments        
Assets        
Total assets $ 7,137,000   $ 3,000,000