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BUSINESS COMBINATIONS - Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Jul. 17, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Stock awards granted (in shares)   5,886 4,993
Wavecell Pte. Ltd.      
Business Acquisition [Line Items]      
Business combination, consideration transferred $ 117.1    
Payments to acquire business 72.8    
Business combination, value of stock issued 44.3    
Cash held back to cover indemnity claims 10.4    
Equity held back to cover indemnity claims $ 8.5    
Vesting period 3 years    
Acquisition costs   $ 1.8  
Wavecell Pte. Ltd. | Time-Based Restricted Stock Awards      
Business Acquisition [Line Items]      
Stock awards granted (in shares) 13,200    
Wavecell Pte. Ltd. | Performance-Based Restricted Stock Awards      
Business Acquisition [Line Items]      
Stock awards granted (in shares) 6,600    
Restricted Cash, Current And Other Accrued Liabilities | Wavecell Pte. Ltd.      
Business Acquisition [Line Items]      
Cash held back to cover indemnity claims $ 3.5    
Restricted Cash, Noncurrent And Other Liabilities, Noncurrent | Wavecell Pte. Ltd.      
Business Acquisition [Line Items]      
Cash held back to cover indemnity claims 6.9    
Other Accrued Liabilities, Current | Wavecell Pte. Ltd.      
Business Acquisition [Line Items]      
Equity held back to cover indemnity claims 2.8    
Other Noncurrent Liabilities | Wavecell Pte. Ltd.      
Business Acquisition [Line Items]      
Equity held back to cover indemnity claims $ 5.7