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v3.21.1

Goodwill - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) segment | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Goodwill [Line Items] |  |  |  |
Goodwill | $ 7,367,000 |  | $ 7,367,000 | $ 7,908,000
Number of reporting units | segment | 2 |  |  |
Impairment charges - goodwill | $ 0 | $ 541,000 | 541,000 |
Oblong Industries |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 7,367,000 |  | 7,367,000 | 7,367,000
Impairment charges - goodwill | 0 |  | 0 |
Oblong (formerly Glowpoint) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 0 |  | 0 | $ 541,000
Impairment charges - goodwill |  | $ 541,000 | $ 541,000 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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