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CREDIT FACILITY AND LONG-TERM DEBT CREDIT FACILITY AND LONG-TERM DEBT - Narrative (Details)
12 Months Ended
Sep. 17, 2019
USD ($)
day
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Proceeds from convertible debt   $ 0 $ 86,250,000 $ 0
Debt instrument, convertible, conversion ratio   0.0115434    
Convertible notes, equity     29,834,000  
Debt instrument, convertible, remaining discount amortization period   68 months 15 days    
Share price (in dollars per share) | $ / shares   $ 145.65    
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Repayments of debt   $ 12,800,000    
Line of Credit | Letter of Credit        
Debt Instrument [Line Items]        
Debt instrument, collateral amount   2,000,000.0    
Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, interest rate, effective percentage 15.30%      
Senior Convertible Note        
Debt Instrument [Line Items]        
Proceeds from convertible debt $ 83,700,000      
Debt instrument, convertible, if-converted value in excess of principal   58,800,000    
Senior Convertible Note | Convertible Debt        
Debt Instrument [Line Items]        
Face amount $ 86,250,000 86,250,000 86,250,000  
Debt instrument, interest rate, stated percentage 3.75%      
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 86.63      
Debt instrument, shares issuable upon conversion (in shares) | shares 995,618      
Debt instrument, debt default, maximum rate increase 0.50%      
Debt instrument, convertible, carrying amount of equity component   39,500,000    
Debt instrument, debt issuance costs, net   1,500,000    
Convertible notes, equity   9,700,000    
Interest expense, debt   6,345,000 $ 2,669,000  
Fair Value, Inputs, Level 2 | Senior Convertible Note        
Debt Instrument [Line Items]        
Convertible debt, fair value disclosures   $ 156,900,000    
Initial Purchasers | Senior Convertible Note | Convertible Debt        
Debt Instrument [Line Items]        
Face amount $ 11,250,000      
Debt Instrument, Redemption, Period One | Senior Convertible Note | Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold trading days | day 20      
Debt instrument, convertible, threshold consecutive trading days | day 30      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt Instrument, Redemption, Period Two | Senior Convertible Note | Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive trading days | day 5      
Debt instrument, convertible, threshold percentage of stock price trigger 98.00%      
Debt instrument, convertible, threshold business trading days | day 5      
Debt Instrument, Redemption, Period Three | Senior Convertible Note | Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold trading days | day 20      
Debt instrument, convertible, threshold consecutive trading days | day 30      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt instrument, redemption price, percentage 100.00%