Discontinued Operations and Assets Held for Sale - Schedule Of Results From Discontinued Operations Alternative Cash Flow Information (Detail) - Foundry Services Group And Fab Three Foundry Services [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Significant non-cash operating activities:
Depreciation and amortization	$ 5,365	$ 16,958
Provision for severance benefits	8,209	5,997
Stock-based compensation	388	259
Investing activities:
Capital expenditures	$ (5,838)	$ (9,174)