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Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Square feet of office space | ft²	86,000
Average initial lease term	4 years
Lease liability	$ 3,404	$ 4,717		$ 5,700
Discount rate	5.30%
Operating leases, rent expense, net	$ 1,600	1,600	$ 1,400
Total lease payments	1,700	1,600	1,300
Lease obligation incurred	$ 200	$ 500	$ 800
Minimum [Member]
Lease term range	1 year
Maximum [Member]
Lease term range	3 years 9 months 18 days
Weighted Average [Member]
Lease term range	1 year 4 months 24 days

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Area of land held.

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- Definition

Amount of increase in lease obligation from new lease.

+ References

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- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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