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LEASES - Narrative (Details)
ft² in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
ft²
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2022
ft²
Lessee, Lease, Description [Line Items]        
Operating lease right-of-use assets $ (61.6) $ (103.9)    
Total future lease payments 161.2      
Lease termination accrual 4.4 0.0    
Loss on termination of lease 7.7 0.0 $ 0.0  
Loss due to abandonment of facility   13.0    
Goodwill and long-lived asset impairment charges   16.9    
Lease cost 25.9 22.1    
Variable lease expense $ 3.5 3.2    
Operating lease weighted average remaining lease term 9 years 4 months 24 days      
Operating lease weighted average discount rate 6.34%      
West Salt Lake City        
Lessee, Lease, Description [Line Items]        
Area of real estate property | ft²       234
Operating lease right-of-use assets $ (5.9)      
Operating Lease, Liability $ (5.9)      
Lease term (in years) 15 years      
Total future lease payments $ 79.6      
Lease termination accrual 8.5      
West Salt Lake City | Scenario, Adjustment        
Lessee, Lease, Description [Line Items]        
Operating lease right-of-use assets 33.3      
Operating Lease, Liability 39.6      
Salt Lake City        
Lessee, Lease, Description [Line Items]        
Reduction in operating lease, right-of-use assets 6.4      
Reduction in operating lease liability 6.4      
South San Francisco, California        
Lessee, Lease, Description [Line Items]        
Area of real estate property | ft²       63
Total future lease payments $ 56.7      
Lease term (in years)       10 years
Lessee, operating lease, lease not yet commenced, right-of-use asset   30.7    
Lessee, operating lease, lease not yet commenced, liability   30.7    
Area of real estate, space utilized to perform testing | ft² 49      
Leasehold improvements        
Lessee, Lease, Description [Line Items]        
Impairment charge   $ 3.9    
Minimum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms 1 year      
Maximum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms 15 years