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v3.21.1

Concentration of Risk (Details) - customer | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Revenue | Customer concentration risk |  |  |
Concentration of Risk |  |  |
Number of customers | 1 | 4 |
Revenue | Customer concentration risk | First customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 29.60% | 20.90% |
Revenue | Customer concentration risk | Second customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk |  | 16.90% |
Revenue | Customer concentration risk | Third customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk |  | 14.60% |
Revenue | Customer concentration risk | Fourth customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk |  | 10.70% |
Consolidated accounts receivable | Credit concentration risk |  |  |
Concentration of Risk |  |  |
Number of customers | 1 |  | 2
Consolidated accounts receivable | Credit concentration risk | First customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 19.80% |  | 23.80%
Consolidated accounts receivable | Credit concentration risk | Second customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk |  |  | 11.90%

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- Definition Represents the number of customers on whom the entity significantly relies giving rise to concentration risk. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Details
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