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Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 212,286	$ 143,392
Prepaid taxes	9,361	8,046
Prepaid maintenance and other services	13,116	8,503
Other prepayments	15,329	16,753
Total prepayments	$ 250,092	$ 176,694

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