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Summary of Significant Accounting Policies - Concentration of Risk (Details) - customer	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue | Customer concentration risk
Concentration of Risk
Number of customers	2	2	1
Revenue | Customer concentration risk | Ten largest customers
Concentration of Risk
Number of customers	10	10	10
Percentage of concentration risk	76.90%	73.30%	70.20%
Revenue | Customer concentration risk | First customer
Concentration of Risk
Percentage of concentration risk	20.10%	24.90%	17.00%
Revenue | Customer concentration risk | Second customer
Concentration of Risk
Percentage of concentration risk	12.10%	13.10%
Consolidated accounts receivable | Credit concentration risk
Concentration of Risk
Number of customers	2	3
Consolidated accounts receivable | Credit concentration risk | First customer
Concentration of Risk
Percentage of concentration risk	21.90%	19.80%
Consolidated accounts receivable | Credit concentration risk | Second customer
Concentration of Risk
Percentage of concentration risk	11.50%	11.80%
Consolidated accounts receivable | Credit concentration risk | Third customer
Concentration of Risk
Percentage of concentration risk		10.60%

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- Definition

Represents the number of customers on whom the entity significantly relies giving rise to concentration risk.

+ References

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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.

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 20
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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