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Convertible Senior Notes - Capped Call Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended
Feb. 14, 2020
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]      
Payment of capped call transactions $ 28,900 $ 28,865 $ 0
Price cap (in dollars per share) $ 48.88    
Premium percentage over sale price 100.00%    
Number of shares subject to anti-dilution adjustments (in shares) 8.9    
Convertible Debt | 2027 Notes      
Debt Instrument [Line Items]      
Conversion price (in dollars per share) $ 32.38