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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
trading_day
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 12, 2020
$ / shares
Debt Instrument [Line Items]              
Accumulated deficit     $ (651,197)     $ (659,210)  
Convertible senior notes, net - long-term     280,599     202,984  
Debt issuance costs, net     8,809        
Payment for capped call transactions related to convertible senior notes   $ 34,069   $ 34,069      
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment              
Debt Instrument [Line Items]              
Accumulated deficit         $ 9,000    
Additional paid in capital         (85,800)    
Convertible senior notes, net - long-term         $ 76,800    
Convertible senior notes | Convertible debt              
Debt Instrument [Line Items]              
Principal amount $ 287,500   287,500     287,500  
Interest rate 1.50%            
Net proceeds from issuance of convertible notes $ 244,600            
Debt instrument, convertible, conversion ratio 0.0088836            
Conversion price (usd per share) | $ / shares $ 112.57            
Debt instrument, convertible, threshold trading days | trading_day 20            
Debt instrument, convertible, threshold trading days consecutive trading days | trading_day 30            
Redemption price percentage 100.00%            
Carrying amount of the equity component $ 85,800   $ 0     85,803  
Effective interest rate 9.90%   2.20%        
Debt issuance costs related to equity component $ 2,700            
Debt issuance costs related to liability component 6,100            
Debt issuance costs, net     $ 6,901     $ 5,446  
Debt instrument, term     3 years 9 months 18 days        
Payment for capped call transactions related to convertible senior notes $ 34,100            
Debt instrument, initial cap price per share (usd per share) | $ / shares $ 173.18            
Sale price (usd per share) | $ / shares             $ 86.59
Convertible senior notes | Convertible debt | Conversion Instance, 130%              
Debt Instrument [Line Items]              
Debt instrument, convertible, threshold trading days | trading_day 20            
Debt instrument, convertible, threshold trading days consecutive trading days | trading_day 30            
Convertible senior notes | Convertible debt | Conversion Instance, 98%              
Debt Instrument [Line Items]              
Debt instrument, convertible, threshold trading days | trading_day 5            
Debt instrument, convertible, threshold trading days consecutive trading days | trading_day 5            
Convertible senior notes | Convertible debt | Minimum              
Debt Instrument [Line Items]              
Conversion price (usd per share) | $ / shares $ 112.57   $ 112.57        
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%            
Convertible senior notes | Convertible debt | Minimum | Conversion Instance, 130%              
Debt Instrument [Line Items]              
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%            
Convertible senior notes | Convertible debt | Minimum | Conversion Instance, 98%              
Debt Instrument [Line Items]              
Debt instrument, convertible, threshold percentage of stock price trigger 98.00%            
Convertible senior notes | Convertible debt | Maximum              
Debt Instrument [Line Items]              
Conversion price (usd per share) | $ / shares $ 173.18