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Summary of Significant Accounting Policies New Accounting Pronouncements - Recent Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2021
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt   $ 47,215 $ 47,215    
Retained Earnings (Accumulated Deficit)       $ (485,043) $ (438,773)
Accounting Standards Update 2020-06          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Debt Instrument, Unamortized Discount and Debt Issuance Cost $ 68,800        
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 80,100        
Retained Earnings (Accumulated Deficit) $ 11,300