Summary of Significant Accounting Policies, Concentration of Credit Risk (Details) - Customer	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Revenue [Member] \| Customer Concentration Risk [Member]
Revenue by major customers [Abstract]
Number of major customers	2	2
Revenue [Member] \| Customer Concentration Risk [Member] \| Customer One [Member]
Revenue by major customers [Abstract]
Percentage contributed by major customers	14.30%	20.80%
Revenue [Member] \| Customer Concentration Risk [Member] \| Customer Two [Member]
Revenue by major customers [Abstract]
Percentage contributed by major customers	26.90%	18.20%
Contract Receivables [Member]
Revenue by major customers [Abstract]
Percentage contributed by major customers	16.80%	26.70%
Contract Receivables [Member] \| Customer Concentration Risk [Member]
Revenue by major customers [Abstract]
Percentage contributed by major customers	16.80%	26.70%
Number of major customers	1	1

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.

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
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-URI http://asc.fasb.org/extlink&oid=109250915&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
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-URI http://asc.fasb.org/extlink&oid=109250915&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
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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