Variable Interest Entities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) variable_interest_entity	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2013 patent
Variable Interest Entity [Line Items]
Variable interest entities assets	$ 60,600	$ 29,900
Variable interest entities liabilities	5,400	6,100
Noncontrolling interests	$ (5,977)	(5,556)	$ (5,506)
Primary Beneficiary
Variable Interest Entity [Line Items]
Number of variable interest entities | variable_interest_entity	3
Number of patents (more than) | patent				500
Chordant
Variable Interest Entity [Line Items]
Noncontrolling interests	$ 1,500
Convida
Variable Interest Entity [Line Items]
Noncontrolling interests	4,500	5,600	$ 5,500
Cash and Cash Equivalents
Variable Interest Entity [Line Items]
Variable interest entities assets	18,500	11,700
Accounts Receivable
Variable Interest Entity [Line Items]
Variable interest entities assets	1,700	1,300
Patents
Variable Interest Entity [Line Items]
Variable interest entities assets	39,300	14,400
Other Noncurrent Assets
Variable Interest Entity [Line Items]
Variable interest entities assets	$ 1,300	$ 2,500