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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Securities Borrowed and Securities Loaned
Minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned	102.00%
Class B interests | East MIP
Property and Equipment and Capitalized Software
Amortization expense related to share based compensation	$ 20	$ 300
Furniture, fixtures and equipment | Minimum
Property and Equipment and Capitalized Software
Estimated useful lives	3 years
Furniture, fixtures and equipment | Maximum
Property and Equipment and Capitalized Software
Estimated useful lives	7 years
Leasehold improvements
Property and Equipment and Capitalized Software
Estimated useful lives	7 years
Capitalized software | Minimum
Property and Equipment and Capitalized Software
Estimated useful lives	1 year 4 months 24 days
Capitalized software | Maximum
Property and Equipment and Capitalized Software
Estimated useful lives	2 years 6 months

X

- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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+ References

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- Definition

Represents the minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned.

+ References

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