Balance Sheet Components - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 700,000	$ 800,000
Property and equipment, gross	51,484,000	38,275,000
Accumulated amortization on the property under capital lease	27,000
Accumulated amortization on the property under capital lease		27,000
Capitalized interest	1,500,000
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property and equipment, gross	54,000	24,000
Laboratory and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,610,000	1,434,000
Impairment of long-lived assets	$ 0	500,000
D107 Assets
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets		400,000
Custom Manufacturing Assets
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets		$ 100,000