Purchased Intangible Assets and Goodwill - Estimated Useful Life (Details)		3 Months Ended	12 Months Ended
	May 09, 2018	Mar. 31, 2020	Dec. 31, 2019
Developed Technology Rights [Member] | S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	5 years
Developed Technology Rights [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		4 years	4 years
Developed Technology Rights [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		10 years	10 years
Customer Relationships [Member] | S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	7 years
Customer Relationships [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		7 years	7 years
Customer Relationships [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		12 years	12 years
Order or Production Backlog [Member] | Certain Flash Memory Product Assets from Atmel Corporation [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		1 year	1 year
Order or Production Backlog [Member] | S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	6 months	6 months	6 months
Non-compete Agreements [Member] | S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	2 years
Non-compete Agreements [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		2 years	2 years
Non-compete Agreements [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		5 years	5 years
Trademarks [Member] | S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	12 years
Trademarks [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		8 years	8 years
Trademarks [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		12 years	12 years