Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 37,553	$ 36,305
Less accumulated depreciation	(26,733)	(23,977)
Property and equipment, net	10,820	12,328
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,689	5,321
Laboratory and clean room equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,379	14,894
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,335	15,118
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,150	$ 972