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Revenue Recognition - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
Revenue Recognition - Narrative (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue
Revenue recognized	$ 48,000	$ 339,000	$ 339,000
Corporate Restructuring Plan
Deferred Revenue
Restructuring reserve		0		$ 2,354,000
NET Services
Deferred Revenue
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 632,000	$ 2,572,000