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Long-term Debt - 2024 Notes (Details) - Senior Notes
$ / shares in Units, shares in Millions
 1 Months Ended 12 Months Ended
Dec. 01, 2021
USD ($)
Aug. 31, 2020
USD ($)
shares
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 30, 2019
Debt Instrument [Line Items]              
Payments of debt issuance costs   $ 2,500,000          
2024 Notes              
Debt Instrument [Line Items]              
Face amount   $ 117,100,000   $ 117,051,000 $ 117,051,000    
Interest rate   3.50%          
Debt conversion, converted instrument, amount   $ 84,200,000          
Debt issuance costs   $ 3,000,000          
Interest expense       4,100,000 1,500,000    
Conversion price (in dollars per share) | $ / shares   $ 18.23          
Initial conversion amount (in shares) | shares   6.4          
Long-term debt, net of discount   $ 78,900,000          
Debt issuance costs, net, debt component   $ 1,700,000          
Non-cash amortization of debt discount and debt issuance costs       7,900,000 2,700,000    
Repurchase covenant, repurchase price due to fundamental change as percentage of principal amount   100.00%          
Repurchase covenant, sale price as a percentage of conversion price   130.00%          
Repurchase covenant, trading days, minimum   20 days          
Repurchase covenant, consecutive trading days, minimum   30 days          
Repurchase covenant, repurchase price due to change in sale price as percentage of conversion price   100.00%          
2024 Notes | Common Stock              
Debt Instrument [Line Items]              
Debt issuance costs   $ 1,300,000          
Proceeds from issuance of debt   38,100,000          
2021 Notes              
Debt Instrument [Line Items]              
Face amount     $ 125,000,000 0 26,737,000    
Interest rate     2.00%       2.00%
Debt conversion, converted instrument, amount $ 26,700,000            
Debt conversion, original debt, amount 26,300,000 84,200,000          
Payments of debt issuance costs $ 400,000            
Debt issuance costs     $ 4,600,000        
Interest expense       $ 500,000 $ 1,700,000 $ 2,500,000  
Proceeds from issuance of debt     $ 120,400,000        
New Notes              
Debt Instrument [Line Items]              
Debt conversion, converted instrument, amount   $ 32,800,000