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Liquidity (Details) - USD ($)
$ in Thousands
Sep. 12, 2019
Sep. 30, 2020
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]      
Cash and cash equivalents   $ 143,134 $ 147,144
Note Purchase Agreement - Third Delayed Draw Notes | Senior Notes      
Subsidiary, Sale of Stock [Line Items]      
Debt face amount $ 20,000    
Note Purchase Agreement - Third Delayed Draw Notes | Senior Notes | Quarter Ended September 30, 2020      
Subsidiary, Sale of Stock [Line Items]      
Debt issuance criteria term, net sales and royalties benchmark $ 14,500