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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions		3 Months Ended		9 Months Ended
	Sep. 26, 2016 CNY (¥)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges		$ 446	$ 81	$ 6,145	$ 1,598
Assets held for sale		12,403		12,403		$ 0
Guangzhou Factory | Disposed of by sale
Restructuring Cost and Reserve [Line Items]
Consideration	¥ 320	48,000		48,000
Period to cease operations (up to)	24 months
Expected term of completion	28 months
Escrow deposit as percentage of purchase price	10.00%
Assets held for sale		12,400		12,400
Employee severance | Manufacturing activities transition | Accrued compensation
Restructuring Cost and Reserve [Line Items]
Unpaid severance costs		200		200
Employee severance | Manufacturing activities transition | Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges		$ 400	$ 100	$ 6,100	$ 1,600

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