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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
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Details

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