Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Summary of Significant Accounting Policies
Unrecognized tax benefits	$ 0		$ 0		$ 0
Income tax penalties and interest expense	$ 0	$ 0	$ 0	$ 0