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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant non-cash operating activities:
Depreciation and amortization	$ 5,365	$ 22,411
Provision for severance benefits	8,209	10,879
Stock-based compensation	388	899
Investing activities:
Capital expenditures	$ (5,838)	$ (11,653)