Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.3
Basis of Presentation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
product
Sep. 30, 2018
USD ($)
Liberty        
Reimbursable amount | $ $ 0.7 $ 0.8 $ 18.6 $ 2.6
Skyhook        
Number of primary products | product     2  
Charter        
Investment control percentage     25.01%