Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,546	$ 40,935
Less accumulated depreciation	(31,273)	(29,498)
Property and equipment, net	10,273	11,437
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,039	6,010
Laboratory and clean room equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,424	15,524
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,062	15,295
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,972	3,321
Asset retirement cost
Property, Plant and Equipment [Line Items]
Property and equipment, gross	860	785
Finance lease assets
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 189	$ 0