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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 |  |  |

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