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Debt - 2026 Convertible Notes (Details)
Feb. 28, 2020
USD ($)
day
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Debt Instrument [Line Items]      
Total net proceeds $ 344,722,000    
Class A voting common stock      
Debt Instrument [Line Items]      
Common stock, par value (in usd per share) | $ / shares   $ 0.001 $ 0.001
2026 Convertible Notes      
Debt Instrument [Line Items]      
Cash redemption price, percent 100.00%    
2026 Convertible Notes | Class A voting common stock      
Debt Instrument [Line Items]      
Common stock, par value (in usd per share) | $ / shares $ 0.001    
2026 Convertible Notes | Convertible notes      
Debt Instrument [Line Items]      
Principal $ 400,000,000 $ 400,000,000 $ 400,000,000
Stated rate 0.25%    
Conversion price (in usd per share) | $ / shares $ 91.03    
Conversion option $ 125,160,000    
Effective interest rate 6.763%    
Carrying amount of equity component $ 57,491,000    
Annual effective interest rate 6.907%    
Issuance costs attributable to the liability component $ 8,217,000    
Issuance costs $ 3,742,000 $ 3,742,000 $ 3,742,000
2026 Convertible Notes | Convertible notes | Conversion option 2      
Debt Instrument [Line Items]      
Trading days | day 5,000    
Consecutive trading days | day 10,000    
2026 Convertible Notes | Convertible notes | Class A voting common stock      
Debt Instrument [Line Items]      
Conversion ratio 10.9857    
2026 Convertible Notes | Convertible notes | Class A voting common stock | Conversion option 1      
Debt Instrument [Line Items]      
Stock price trigger percent 130.00%    
Trading days | day 20    
Consecutive trading days | day 30    
2026 Convertible Notes | Convertible notes | Class A voting common stock | Conversion option 2      
Debt Instrument [Line Items]      
Stock price trigger percent 98.00%