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Debt - 2014 Convertible Notes and Credit Facility (Details) - USD ($)
12 Months Ended
Jul. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
May 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]            
Interest expense   $ 15,300,000 $ 2,500,000      
Convertible debt            
Debt Instrument [Line Items]            
Interest expense   7,700,000        
Convertible debt | 2014 Notes            
Debt Instrument [Line Items]            
Funds drawn at closing   $ 0        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Fee amount       $ 6,500,000    
Funds drawn at closing       0    
Revolving Credit Facility | Delayed Draw Term Loan            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 200,000,000 $ 100,000,000 $ 100,000,000
Common Stock | 2014 Notes            
Debt Instrument [Line Items]            
Conversion of stock (in shares) 5,040,323          
Additional shares converted (in shares) 329,124          
Induced conversion of convertible debt expense     $ 24,100,000