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Convertible Notes Payable - Summary of Outstanding Balances of Convertible Notes (Details) - Convertible debt - 3.00% Convertible notes - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 12, 2017
Debt Instrument [Line Items]    
Principal $ 192,753 $ 305,000
Less: debt discount and issuance costs, net (2,481)  
Net carrying amount $ 190,272 $ 166,300