Revenue Recognition, Future Undiscounted Fixed Payments from International Recurring Revenue Customers (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 81
International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	4,426
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 79
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 984
Expected timing of satisfaction period	9 months
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	$ 1,317
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	$ 1,226
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	$ 776
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	$ 123
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | International [Member]
Remaining Performance Obligation [Abstract]
Future undiscounted fixed payments from international recurring revenue customers	$ 0
Expected timing of satisfaction period