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Summary of Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accumulated deficit $ (298,335) $ (262,551) $ (270,313)
1.75% Convertible Senior Notes due 2023      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Debt conversion $ 39    
Revision of Prior Period, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accumulated deficit   $ 7,762