Balance Sheet Details (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 89,998	$ 79,202
Less accumulated depreciation and amortization	(65,621)	(59,242)
Total property and equipment, net	24,377	19,960
Machinery, furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	55,146	50,195
Leased equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,911	0
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,740	8,955
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,990	17,742
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,211	$ 2,310