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CONVERTIBLE NOTES AND CREDIT FACILITY - Convertible Notes Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 17, 2019
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Proceeds from convertible debt       $ 0 $ 86,250,000  
Interest expense, debt   $ 2,300,000   $ 7,000,000.0    
Debt instrument, convertible, remaining discount amortization period       71 months 15 days    
Share price | $ / shares   $ 98.79   $ 98.79    
Senior Convertible Note            
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       $ 12,100,000    
Convertible Debt | Senior Convertible Note            
Debt Instrument [Line Items]            
Aggregate principal amount $ 86,250,000 $ 86,250,000   86,250,000   $ 86,250,000
Debt instrument, interest rate, stated percentage 3.75%          
Conversion price (in dollars per share) | $ / shares $ 86.63          
Interest expense, debt   2,333,000 $ 337,000 6,999,000 $ 337,000  
Carrying amount of equity component   39,508,000   39,508,000   39,508,000
Fair Value, Inputs, Level 2 | Senior Convertible Note            
Debt Instrument [Line Items]            
Convertible debt, fair value   $ 117,700,000   $ 117,700,000   $ 116,000,000.0
Initial Purchasers | Convertible Debt | Senior Convertible Note            
Debt Instrument [Line Items]            
Aggregate principal amount $ 11,250,000