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Long-Term Debt - 2019 Mezzanine Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt      
Available borrowing capacity   $ 30,000  
Proceeds from issuance of debt   9,563 $ 19,920
2019 Mezzanine Term Loan      
Long-Term Debt      
Maximum borrowing capacity $ 10,000 40,000  
Available borrowing capacity   30,000  
Borrowing capacity on achievement of certain performance milestones   $ 10,000  
Spread on variable rate   5.00%  
Line of credit facility, maximum borrowing capacity 10,000 $ 40,000  
Gain (Loss) on Extinguishment of Debt $ 400    
2019 Mezzanine Term Loan | Prime rate      
Long-Term Debt      
Interest rate   9.75%