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COMMITMENTS AND CONTINGENCIES - Additional Information (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
ft²
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
ft²
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Commitments And Contingencies Disclosure [Line Items]              
Commitments related to manufacturing plant and equipment           $ 253,796  
Area for lease | ft²     300,000        
Payments for leases     $ 600        
Increase in payments for leases (as a percent)     3.00%        
Extension term     12 years        
Annual base rent escalation clause (as a percent)         3.00%    
Arizona              
Commitments And Contingencies Disclosure [Line Items]              
Commitments related to manufacturing plant and equipment           406,100 $ 162,000
Term of lease   4 years          
Area for lease | ft²   500          
Payments for leases   $ 1,800          
California              
Commitments And Contingencies Disclosure [Line Items]              
Base rent $ 100            
Annual base rent escalation clause (as a percent) 3.00%            
Minimum              
Commitments And Contingencies Disclosure [Line Items]              
Base rent         $ 100    
Maximum              
Commitments And Contingencies Disclosure [Line Items]              
Base rent         $ 400    
Corporate headquarters              
Commitments And Contingencies Disclosure [Line Items]              
Tenant improvements           4,700 8,600
Term of lease       10 years      
Area for lease | ft²       127,000      
Payments for leases       $ 300      
Increase in payments for leases (as a percent)       3.00%      
Leasehold improvements              
Commitments And Contingencies Disclosure [Line Items]              
Tenant improvements           $ 29,000 $ 24,300