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Intangible Assets - Schedule of Carrying Amounts and Accumulated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Intangible assets with finite lives:    
Gross carrying amount $ 611 $ 601
Accumulated amortization (427) (396)
Intangible assets, net 184 205
Technological know-how    
Intangible assets with finite lives:    
Gross carrying amount 435 430
Accumulated amortization (307) (290)
Intangible assets, net 128 140
Computer software    
Intangible assets with finite lives:    
Gross carrying amount 176 171
Accumulated amortization (120) (106)
Intangible assets, net $ 56 $ 65