Share-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]
Cost of revenues	$ 554,690	$ 518,142
Research and development	123,037	117,662
Sales and marketing	20,380	20,388
Income tax benefit	994	4,554
Share Based Compensation [Member]
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]
Cost of revenues	90	204
Research and development	3,165	5,222
General and administrative	387	723
Sales and marketing	544	995
Total compensation recognized in income	4,186	7,144
Income tax benefit	$ 894	$ 1,525

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The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories.

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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