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Organization and Description of Business - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Operating losses | $ 16,131 | $ 21,708 | $ 38,725 | $ 49,460
Recognition of foreign currency translation adjustment upon the liquidation of WisdomTree Japan Inc. | 397 |  | 397 |
Other Nonoperating Gains and Losses [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Recognition of foreign currency translation adjustment upon the liquidation of WisdomTree Japan Inc. | 397 |  | 397 |
WisdomTree Japan [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Operating losses | $ 85 | $ 1,342 | 550 | $ 3,698
Impairment - Japan office lease |  |  | $ 572 |
Acquisition of ETFS Business [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Apr. 11, 2018 |

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