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Organization and Basis of Presentation (Details) - USD ($) | Jan. 02, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 04, 2019 | Jan. 18, 2019
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Business Acquisition [Line Items] |  |  |  |  |
Common stock, par value |  | $ 0.01 | $ 0.01 |  |
Deposits with and other non current receivables from broker-dealers and clearing organizations |  | $ 2,200,000 | $ 1,800,000 |  |
NFS [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash clearing deposits |  | 50,000 | 50,000 |  |
StockCross [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash clearing deposits |  |  | 75,000 |  |
Goldman Sachs [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash clearing deposits |  | 2,000,000 | 2,000,000 |  |
Pershing [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash clearing deposits |  | $ 1,000,000 | $ 1,000,000 |  |
Weeden Prime Services LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of acquired interest |  |  |  | 100.00% |
StockCross Financial Services, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of remaining interest in StockCross purchased under binding letter of intent | 85.00% |  |  |  | 15.00%
Issue of common share in exchange under acquisition | 3,298,774 |  |  |  |

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