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Significant Accounting Policies - ASU 2016-03 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accumulated deficit $ (17,504)   $ (17,504)   $ (68,193)  
General and administrative $ 14,986 $ 12,653 $ 42,009 $ 31,976    
Accounting Standards Update 2016-13 | Revision of Prior Period, Accounting Standards Update, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
General and administrative   $ 500   $ 200    
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accumulated deficit           $ (1,200)