Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v3.20.4
Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Increase in valuation allowance $ 5.9 $ 9.0
U.S. federal statutory income tax rate 21.00% 21.00%