Overview of the Business and Basis of Presentation - Valuation methodology and unobservable inputs (Details) - Preferred Stock [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Assets, Fair value	$ 2,883	$ 2,883
Fair Value, Inputs, Level 3 [Member]
Assets, Fair value	$ 2,883	$ 2,883