Fixed Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 11,080	$ 11,080	$ 10,798
Accumulated depreciation	(10,713)	(10,713)	(8,234)
Fixed assets, net	367	$ 367	2,564
Impairment loss	1,600
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives in Years		10 years
Fixed assets, gross	6,357	$ 6,357	6,075
Manufacturing facility/clean room [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	2,984	$ 2,984	2,984
Manufacturing facility/clean room [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives in Years		3 years
Manufacturing facility/clean room [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives in Years		8 years
Lab equipment and office furniture
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 1,739	$ 1,739	$ 1,739
Lab equipment and office furniture | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives in Years		5 years
Lab equipment and office furniture | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives in Years		8 years