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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 |

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