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CONVERTIBLE NOTES AND CREDIT FACILITY - Convertible Notes Narrative (Details)
3 Months Ended
Sep. 17, 2019
USD ($)
day
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Debt instrument, convertible, remaining discount amortization period   77 months 15 days  
Senior Convertible Note      
Debt Instrument [Line Items]      
Proceeds from convertible debt | $ $ 83,700,000    
Debt instrument, convertible, conversion ratio 0.0115434    
Convertible Debt      
Debt Instrument [Line Items]      
Debt instrument, interest rate, effective percentage 10.80%    
Convertible Debt | Senior Convertible Note      
Debt Instrument [Line Items]      
Aggregate principal amount | $ $ 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    
Debt conversion, converted instrument, shares issued (in shares) | shares 995,618.25    
Debt instrument, debt default, maximum rate increase 0.50%    
Interest expense, debt | $   2,333,000  
Carrying amount of equity component | $   39,508,000 39,508,000
Convertible Debt | Senior Convertible Note | Redemption of notes prior to March 15, 2026      
Debt Instrument [Line Items]      
Threshold trading days | day 20    
Threshold consecutive trading days | day 30    
Threshold percentage of stock price trigger 130.00%    
Convertible Debt | Senior Convertible Note | Notes measurement period      
Debt Instrument [Line Items]      
Threshold consecutive trading days | day 5    
Threshold percentage of stock price trigger 98.00%    
Threshold business trading days | day 5    
Convertible Debt | Senior Convertible Note | Redemption of notes prior to Sep. 30, 2023      
Debt Instrument [Line Items]      
Threshold trading days | day 20    
Threshold consecutive trading days | day 30    
Threshold percentage of stock price trigger 130.00%    
Debt instrument, redemption price, percentage 100.00%    
Fair Value, Inputs, Level 2 | Senior Convertible Note      
Debt Instrument [Line Items]      
Convertible debt, fair value | $   $ 80,900,000 $ 116,000,000
Initial Purchasers | Convertible Debt | Senior Convertible Note      
Debt Instrument [Line Items]      
Aggregate principal amount | $ $ 11,250,000