Quarterly report pursuant to Section 13 or 15(d)

Investments (Details)

v3.10.0.1
Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Aug. 31, 2016
Convertible Debt Securities | WayBlazer Note 1        
Schedule of Investments [Line Items]        
Original cash paid $ 2.0      
Interest rate stated percentage 8.00%      
Maximum | Compstak        
Schedule of Investments [Line Items]        
Ownership percentage, less than       20.00%
Other Assets | Series A-1 | Convertible Preferred Stock | Compstak        
Schedule of Investments [Line Items]        
Carrying value of investment   $ 3.0 $ 3.0  
Interest Expense and Other | WayBlazer Note 1        
Schedule of Investments [Line Items]        
Nonoperating loss   $ 2.0