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Employee Benefit Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Matching contributions | $ 0 | $ 0 | $ 0
Hudson Employee Retirement Savings Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of company's matching contribution | 50.00% |  |
Percentage of employees eligible earnings for company's matching contribution | 6.00% |  |
Total contributions to the retirement plan | $ 55,000 | $ 79,000 | $ 89,000

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- Details
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