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Employee Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	$ 0	$ 55,000	$ 79,000

X

- Definition

Defined contribution plan percentage of employees' eligible earnings first slab for company's matching contribution.

+ References

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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