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CONVERTIBLE NOTES AND CREDIT FACILITY - Convertible Notes Narrative (Details)
3 Months Ended
Sep. 17, 2019
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Jan. 01, 2021
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Debt instrument, convertible, remaining discount amortization period   66 months      
Share price | $ / shares   $ 168.46      
Convertible Senior Notes          
Debt Instrument [Line Items]          
Proceeds from convertible debt $ 83,700,000        
Debt instrument, convertible, conversion ratio 0.0115434        
Debt instrument, convertible, if-converted value in excess of principal   $ 81,500,000      
Convertible Debt | Convertible Senior Notes          
Debt Instrument [Line Items]          
Aggregate principal amount $ 86,250,000 86,250,000     $ 86,250,000
Debt instrument, interest rate, stated percentage 3.75%        
Interest expense, debt   911,000 $ 2,333,000    
Convertible Debt | Convertible Senior Notes | Accounting Standards Update 2020-06          
Debt Instrument [Line Items]          
Debt instrument, interest rate, effective percentage       4.35%  
Fair Value, Inputs, Level 2 | Convertible Senior Notes          
Debt Instrument [Line Items]          
Convertible debt, fair value   $ 180,400,000     $ 156,900,000
Initial Purchasers | Convertible Debt | Convertible Senior Notes          
Debt Instrument [Line Items]          
Aggregate principal amount $ 11,250,000