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Summary of Significant Accounting Policies - Internal-Use Software Costs (Details) (10-K) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Line Items] |  |  |  |  |
Impairments to internal-use software |  |  | $ 0 | $ 0 | $ 0
Capitalized internal-use software, net | $ 4,800,000 |  | 4,900,000 | 3,100,000 |
Capitalized internal-use software costs, amortization | $ 600,000 | $ 400,000 | $ 1,800,000 | $ 1,100,000 | $ 700,000
Computer Software |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life |  |  | 3 years |  |

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- Definition Amount of expense for amortization of capitalized computer software costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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