Commitments and Contingencies - Schedule of Other Information related to Stamford Lease and New Stamford Lease (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Operating cash outflows relating to operating leases	$ 487	$ 478	$ 972	$ 954
ROU assets obtained in exchange for new operating lease liabilities
Remaining lease term - operating leases (years)	1 year 6 months	2 years 6 months	1 year 6 months	2 years 6 months
Discount rate - operating leases	7.00%	7.00%	7.00%	7.00%

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

+ References

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-Publisher FASB
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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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-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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