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Leases - Additional Information (Detail) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 01, 2018 USD ($) ft²	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Lease	Jun. 30, 2021 USD ($)
Operating lease, weighted average discount rate, percent		13.00%		13.00%
Number of new leases | Lease				0
Remaining terms		9 months 18 days		9 months 18 days
Operating Lease, Payments		$ 24	$ 35	$ 59	$ 69
Building [Member]
Leased spaced area | ft²	5,600
Operating lease term	60 months
Building [Member] | Minimum [Member]
Operating lease rent expense	$ 10
Building [Member] | Maximum [Member]
Operating lease rent expense	$ 12
Office Equipment [Member]
Operating lease term		36 months		36 months
Operating lease rent expense		$ 23	$ 30	$ 61	$ 61

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- Definition

Number of new leases.

+ References

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Area of land held.

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- Definition

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

+ References

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-Publisher FASB
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-SubTopic 20
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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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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

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Weighted average discount rate for operating lease calculated at point in time.

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- 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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