Revenue Recognition, Future Undiscounted Fixed Payments from International Recurring Revenue Customers (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 214
International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	1,775
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 163
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 244
Expected timing of satisfaction period	6 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	$ 474
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	$ 474
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	$ 405
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	$ 178
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	$ 0
Expected timing of satisfaction period