Goodwill - Schedule of Goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning balance	$ 7,367,000	$ 7,908,000	$ 7,908,000
Impairment charges	0	(541,000)	(541,000)
Ending balance	7,367,000		7,367,000
Oblong (formerly Glowpoint)
Goodwill [Roll Forward]
Beginning balance	0	541,000	541,000
Impairment charges		(541,000)	(541,000)
Ending balance	0		0
Oblong Industries
Goodwill [Roll Forward]
Beginning balance	7,367,000	$ 7,367,000	7,367,000
Impairment charges	0		0
Ending balance	$ 7,367,000		$ 7,367,000

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration