Fair Value Measurements of Pension Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 969	$ 1,042	$ 910
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	969	1,042
TAIWAN
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	712	827
TAIWAN | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	712	827
GERMANY
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	257	215
GERMANY | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 257	$ 215