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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net realized gains or losses related to its financial assets $ 0 $ 0 $ 0 $ 0  
Level 2          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 0   0   $ 0
Financial liabilities, fair value 0   0   0
Level 3          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 0   0   0
Financial liabilities, fair value 0   0   0
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 52,896   52,896   36,846
Fair Value, Measurements, Recurring | Money market accounts          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 52,896   52,896   36,846
Fair Value, Measurements, Recurring | Level 1          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value 52,896   52,896   36,846
Fair Value, Measurements, Recurring | Level 1 | Money market accounts          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value $ 52,896   $ 52,896   $ 36,846