Income Taxes - Summary of Composition of Net Deferred Income Tax Assets (Liabilities) Of Continuing Operations and Discontinued Operations (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Inventory reserves	$ 1,313	$ 1,338
Derivative liabilities	463
Accrued expenses	3,084	2,493
Property, plant and equipment	3,119	3,391
Accumulated severance benefits	11,842	12,343
Operating lease right-of-use liabilities	899	1,025
Foreign currency translation loss	17,280	9,129
NOL carry-forwards	87,636	121,389
Tax credit carry-forwards	14,164	15,395
Other long-term payable	2,457	944
Interest expense deduction limitation	4,731
Others	1,610	1,629
Total deferred tax assets	148,598	169,076
Less: Valuation allowance	(94,212)	(115,636)	$ (246,224)	$ (248,633)
Deferred tax assets, net	54,386	53,440
Deferred tax liabilities
Derivative assets		417
Prepaid expense	2,300	1,071
Severance benefit deposits	4,227	3,156
Operating lease right-of-use assets	899	1,025
Foreign currency translation gain	5,139	2,431
Others	726	799
Total deferred tax liabilities	13,291	8,899
Net deferred tax assets	$ 41,095	$ 44,541