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DEBT (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 09, 2020
Dec. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Nov. 08, 2020
Debt Instrument [Line Items]          
Outstanding balance       $ 40,025  
Term loan advance, current       13,500  
Loan and Security Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount   $ 60,000      
Floating rate (in percent) 3.70%        
Term loan advance $ 15,000        
Outstanding balance     $ 64,026 40,025  
Term loan advance, current     $ 15,000 $ 13,500  
Loan and Security Agreement | Prime rate          
Debt Instrument [Line Items]          
Basis spread on floating rate 0.30% 1.25%      
Revised Loan and Security Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount $ 85,000        
Floating rate (in percent) 3.70%        
Term loan advance $ 15,000        
Revised Loan and Security Agreement | Prime rate          
Debt Instrument [Line Items]          
Basis spread on floating rate 0.30%        
Revolving line of credit | Loan and Security Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount $ 85,000       $ 60,000
Revolving line of credit | Revised Loan and Security Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount $ 60,000