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Summary of Significant Accounting Policies - Summary of Adjustments to Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jan. 01, 2021
Dec. 31, 2020
 [2]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other long-term liabilities $ 27,578 $ 8,425 [1] $ 9,520 [1]
Additional paid-in capital 821,220 853,266 1,021,344
Accumulated deficit (1,289,789) (874,427) (888,755)
2027 Notes      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Notes, net $ 539,517 538,281 $ 383,436
ASU 2020 06 | Account 2027 Notes Wholly as Debt      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other long-term liabilities [1]   (1,095)  
Additional paid-in capital   (168,078)  
ASU 2020 06 | Cumulative Impact on Interest Expense      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Accumulated deficit   14,328  
ASU 2020 06 | 2027 Notes | Account 2027 Notes Wholly as Debt      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Notes, net   $ 169,173  
[1] Related deferred tax liability was recorded as part of “Other long-term liabilities.”
[2] The condensed consolidated balance sheet as of December 31, 2020 is derived from the audited consolidated financial statements as of that date.