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CONVERTIBLE NOTES AND CREDIT FACILITY - Convertible Notes Narrative (Details)
3 Months Ended 6 Months Ended
Sep. 17, 2019
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jan. 01, 2021
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Debt instrument, convertible, remaining discount amortization period       63 months      
Share price | $ / shares   $ 229.73   $ 229.73      
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       $ 142,500,000      
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%            
Interest expense, debt   912,000 $ 2,333,000 1,822,000 $ 4,666,000    
Convertible Debt | Senior Convertible Note | Accounting Standards Update 2020-06              
Debt Instrument [Line Items]              
Debt instrument, interest rate, effective percentage           4.35%  
Fair Value, Inputs, Level 2 | Senior Convertible Note              
Debt Instrument [Line Items]              
Convertible debt, fair value   $ 235,400,000   $ 235,400,000     $ 156,900,000
Initial Purchasers | Convertible Debt | Senior Convertible Note              
Debt Instrument [Line Items]              
Aggregate principal amount $ 11,250,000