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Summary of Significant Accounting Policies - Service Level Standards and Research and Development (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Research and Development
Unamortized software development costs	$ 11,695	$ 5,754	$ 4,390
Amortization expenses of capital software development costs	$ 3,178	$ 3,507	$ 55
Software Development
Research and Development
Estimated minimum useful life of software development costs	2 years
Estimated maximum useful life of software development costs	3 years

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Represents the maximum useful life of capitalized software development costs.

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Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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-Name Accounting Standards Codification
-Topic 985
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-Section 50
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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
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