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Fair Value Measurement of Assets and Liabilities - Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
May 12, 2020
Liabilities      
Interest make-whole payment $ 2,900   $ 4,600
Recurring      
Assets      
Total assets 126 $ 126  
Liabilities      
Total liabilities 2,929 4,898  
Recurring | Interest make-whole provision      
Liabilities      
Interest make-whole payment 2,929 4,898  
Recurring | Money market funds      
Assets      
Money market funds 126 126  
Recurring | Level 1      
Assets      
Total assets 126 126  
Liabilities      
Total liabilities 0 0  
Recurring | Level 1 | Interest make-whole provision      
Liabilities      
Interest make-whole payment 0 0  
Recurring | Level 1 | Money market funds      
Assets      
Money market funds 126 126  
Recurring | Level 3      
Assets      
Total assets 0 0  
Liabilities      
Total liabilities 2,929 4,898  
Recurring | Level 3 | Interest make-whole provision      
Liabilities      
Interest make-whole payment 2,929 4,898  
Recurring | Level 3 | Money market funds      
Assets      
Money market funds $ 0 $ 0