Acquisitions, Goodwill and Identified Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Acquisitions Goodwill And Identified Intangible Assets [Line Items]
Merger agreement date	Dec. 18, 2019
Goodwill	$ 385,784,000		$ 385,784,000
Goodwill impairment charges	0
Amortization expense	22,509,000	$ 25,459,000
Product Licensing Segment
Acquisitions Goodwill And Identified Intangible Assets [Line Items]
Goodwill	378,100,000		378,100,000
Semiconductor and IP Licensing Segment
Acquisitions Goodwill And Identified Intangible Assets [Line Items]
Goodwill	$ 7,700,000		$ 7,700,000