Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.21.1
Significant Accounting Policies - Additional Information (Details) - USD ($)
1 Months Ended
Sep. 30, 2016
Dec. 31, 2020
Dec. 31, 2019
Significant Accounting Policies      
Stock Issued During Period, Shares, New Issues 250,000    
Preferred Stock, Dividend Rate, Percentage 2.50%    
Amounts accrued for the payment of interest and penalties   $ 0 $ 0