Quarterly report pursuant to Section 13 or 15(d)

Investments in Debt Securities - Fair value of available-for-sale debt securities (Details)

v3.20.4
Investments in Debt Securities - Fair value of available-for-sale debt securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
2021 $ 6,073  
2022 10,322  
Fair value $ 16,395 $ 0