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DEBT AND FINANCING ARRANGEMENTS - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2024
USD ($)
numberOfDays
$ / shares
Sep. 22, 2020
USD ($)
numberOfDays
$ / shares
Apr. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 29, 2024
Apr. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 30, 2020
USD ($)
Dec. 29, 2020
USD ($)
May 21, 2018
USD ($)
Debt Instrument [Line Items]                          
Debt Instrument, Increase, Accrued Interest         $ 1,900,000 $ 900,000              
Interest Expense, Nonoperating         (8,900,000) (6,200,000) $ (4,000,000)            
Investment Income, Interest         3,400,000 3,800,000 1,400,000            
Debt instrument, face amount       $ 230,000,000.0 $ 230,000,000.0                
Maximum borrowing capacity, percentage of accounts receivable       50.00% 50.00%                
Debt Instrument, Interest Rate, Stated Percentage       1.00% 1.00%                
Proceeds from issuance of convertible senior notes, net of issuance costs paid of $6,900   $ 222,700,000                      
Accumulated deficit       $ (1,300,576,000) $ (1,300,576,000) (1,111,272,000)              
Other Long-Term Debt       0 0 30,000,000              
Option Indexed to Issuer's Equity, Strike Price | $ / shares   $ 85.14                      
Option Indexed to Issuer's Equity, Cap Price | $ / shares   $ 128.51                      
Proceeds from termination of capped calls related to convertible notes         115,000 0 0            
Gain on debt extinguishment         13,017,000 0 0            
Debt Instrument, Unused Borrowing Capacity, Amount       60,000,000.0 60,000,000.0                
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                          
Debt Instrument [Line Items]                          
Accumulated deficit             11,300,000            
Other Long-Term Debt             40,200,000            
Additional Paid in Capital             $ 51,500,000            
2020 Convertible Senior Notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount       230,000,000 230,000,000                
Debt issuance costs, gross       5,572,000 5,572,000 7,275,000              
Debt issuance costs, net       $ 207,000 $ 207,000 $ 2,496,000              
Debt instrument, interest rate       1.64% 1.64% 1.64%              
Debt Instrument, Interest Rate, Stated Percentage       1.00% 1.00%                
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   98.00%                      
Conversion Price (in usd per share) | $ / shares   $ 85,140                      
Debt Instrument, Redemption Price, Percentage   100.00%                      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfDays   10,000                      
Interest Expense, Debt         $ 1,506,000 $ 3,761,000              
2020 Convertible Senior Notes | Debt Conversion Scenario One                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%                      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfDays   30,000                      
Debt Instrument, Convertible, Threshold Trading Days | numberOfDays   20,000                      
2020 Convertible Senior Notes | Debt Conversion Scenario Two                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Threshold Trading Days | numberOfDays   5,000                      
2020 Convertible Senior Notes | Debt Conversion Scenario Three                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%                      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfDays   30                      
Debt Instrument, Convertible, Threshold Trading Days | numberOfDays   20                      
Convertible Senior Notes, Additional Principal Option                          
Debt Instrument [Line Items]                          
Debt instrument, face amount   $ 30,000,000                      
Lines of Credit                          
Debt Instrument [Line Items]                          
Debt issuance costs, gross       $ 1,211,000 1,211,000 839,000              
Debt issuance costs, net       $ 221,000 $ 221,000 59,000              
Debt instrument, interest rate increase event of default       3.00% 3.00%                
Commitment fee percentage         0.15%                
Long-term finance lease liabilities                         $ 27,400,000
Term loans                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                         20,000,000.0
Long-term finance lease liabilities       $ 0 $ 0 $ 30,000,000              
Convertible Debt | Convertible Senior Notes 2024                          
Debt Instrument [Line Items]                          
Debt instrument, face amount $ 172,500,000                        
Debt Instrument, Interest Rate, Stated Percentage 4.25%                        
Debt Instrument, Convertible, Conversion Ratio 0.0554939                        
Conversion Price (in usd per share) | $ / shares $ 18.02                        
Proceeds from issuance of convertible senior notes, net of issuance costs paid of $6,900 $ 166,800,000     169,300,000                  
Debt Instrument, Face Amount, Additional Principal Available $ 22,500,000                        
Convertible Debt | Convertible Senior Notes 2024 | Debt Conversion Terms One                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%                        
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfDays 30                        
Debt Instrument, Convertible, Threshold Trading Days | numberOfDays 20                        
Convertible Debt | Convertible Senior Notes 2024 | Debt Conversion Terms Two                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 98.00%                        
Debt Instrument, Convertible, Threshold Consecutive Trading Days | numberOfDays 10,000                        
Debt Instrument, Convertible, Consecutive Business Days After Threshold Trading Days 5 days                        
Convertible Debt | 2020 Convertible Senior Notes                          
Debt Instrument [Line Items]                          
Debt Instrument, Convertible, Conversion Ratio 0.0117457                        
Debt Instrument, Repurchased Face Amount       183,900,000 $ 183,900,000                
Gain on debt extinguishment       $ 13,000,000.0                  
Revolving Credit Facility | Lines of Credit                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity                         $ 30,000,000.0
Revolving Credit Facility | Lines of Credit | Line Of Credit 2018                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity                 $ 60,000,000 $ 50,000,000 $ 50,000,000 $ 40,000,000  
Line of Credit Facility, Option To Increase Borrowing Capacity, Maximum                 75,000,000        
Debt Instrument, Covenant, Adjusted Cash, Minimum                 $ 25,000,000        
Debt Instrument, Maximum Borrowing Capacity, Eligible Accounts Receivable, Percentage               75.00% 85.00%        
Basis spread on variable rate         0.25%                
Repayments of Long-Term Lines of Credit     $ 30,000,000.0                    
Interest Expense, Debt         $ 700,000                
Revolving Credit Facility | Lines of Credit | Amended Line Of Credit 2018                          
Debt Instrument [Line Items]                          
Basis spread on variable rate         0.125%                
Revolving Credit Facility | Lines of Credit | Amended Line Of Credit 2018 | United States                          
Debt Instrument [Line Items]                          
Debt Instrument, Maximum Borrowing Capacity, Eligible Accounts Receivable, Percentage       85.00% 85.00%                
Revolving Credit Facility | Lines of Credit | Amended Line Of Credit 2018 | United Kingdom                          
Debt Instrument [Line Items]                          
Debt Instrument, Maximum Borrowing Capacity, Eligible Accounts Receivable, Percentage       30.00% 30.00%