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Summary of Significant Accounting Policies - Concentration of Risk (Details) - customer | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total revenue | Customer concentration risk |  |  |
Concentration of Risk |  |  |
Number of customers | 2 | 2 | 3
Total revenue | Customer concentration risk | Ten largest customers |  |  |
Concentration of Risk |  |  |
Number of customers | 10 | 10 | 10
Percentage of concentration risk | 69.50% | 74.00% | 74.10%
Total revenue | Customer concentration risk | Largest customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 17.80% | 17.90% | 18.20%
Total revenue | Customer concentration risk | Second largest customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 15.40% | 16.40% | 14.20%
Total revenue | Customer concentration risk | Third largest customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk |  |  | 12.00%
Accounts receivable | Credit concentration risk |  |  |
Concentration of Risk |  |  |
Number of customers | 2 | 2 |
Accounts receivable | Credit concentration risk | Largest customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 29.10% | 23.80% |
Accounts receivable | Credit concentration risk | Second largest customer |  |  |
Concentration of Risk |  |  |
Percentage of concentration risk | 13.60% | 11.90% |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: 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 3: 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=123594938&loc=d3e13531-108611 Reference 4: 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=123594938&loc=d3e13537-108611 Reference 5: 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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