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Segments - Summary of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,134	$ 1,540	$ 4,238	$ 3,900
Revenue from Rights Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,649	$ 593	$ 3,550	$ 2,783
US | Revenue from Rights Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	77.30%	38.50%	83.80%	71.40%
GB
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 485	$ 947	$ 688	$ 1,117
GB | Revenue from Rights Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	22.70%	61.50%	16.20%	28.60%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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