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DEBT AND FINANCING ARRANGEMENTS - 2018 Loan Facility (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Apr. 30, 2022
Debt Instrument [Line Items]                
Proceeds from issuance of debt       $ 5,000,000 $ 0      
Repayment of long term line of credit       30,070,000 0      
Long-term line of credit             $ 40,070,000  
Long-term debt, carrying amount   $ 184,411,000   184,411,000     208,920,000  
2024 Convertible Senior Notes, net                
Debt Instrument [Line Items]                
Interest expense   2,114,000 $ 2,114,000 4,227,000 4,227,000      
Long-term debt, carrying amount   169,411,000   169,411,000     168,850,000  
Long-term debt, fair value   70,200,000   $ 70,200,000     $ 62,400,000  
Revolving Credit Facility | Lines of credit | 2018 Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 60,000,000.0
Line of credit facility, maximum borrowing capacity upon syndication               $ 75,000,000.0
Basis spread on variable rate       0.125%        
Commitment fee percentage       0.15%        
Debt instrument, minimum adjusted cash $ 20,000,000.0 20,000,000.0   $ 20,000,000.0   $ 25,000,000.0    
Proceeds from issuance of debt       5,000,000.0        
Repayment of long term line of credit $ 20,100,000     30,100,000        
Repayment of line of credit, net       25,100,000        
Long-term line of credit   15,000,000.0   15,000,000.0        
Line of credit, unused available borrowings   20,700,000   20,700,000        
Interest expense   $ 300,000 $ 100,000 $ 900,000 $ 100,000      
Revolving Credit Facility | Lines of credit | 2018 Line of Credit | United States                
Debt Instrument [Line Items]                
Debt instrument, maximum borrowing, eligible accounts receivable, percentage   85.00%   85.00%        
Revolving Credit Facility | Lines of credit | 2018 Line of Credit | United Kingdom                
Debt Instrument [Line Items]                
Debt instrument, maximum borrowing, eligible accounts receivable, percentage   30.00%   30.00%