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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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[Line Items] for Accounting Policies [Table]

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Amount of expense for amortization of capitalized computer software costs.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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