Annual report pursuant to Section 13 and 15(d)

Nature of business and summary of significant accounting policies, Restricted cash (Details)

v3.20.1
Nature of business and summary of significant accounting policies, Restricted cash (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Restricted Cash [Abstract]    
Restricted cash $ 0.2 $ 0.0
Business Credit Card [Member] | Maximum [Member]    
Restricted Cash [Abstract]    
Restricted cash $ 0.2