Revenue Recognition, Future Undiscounted Fixed Payments from International Recurring Revenue Customers (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 162
International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	2,204
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 139
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 148
Expected timing of satisfaction period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 618
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 618
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 551
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 267
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 2
Expected timing of satisfaction period