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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions		3 Months Ended		6 Months Ended
	Sep. 26, 2016 CNY (¥)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges		$ 449	$ 84	$ 5,699	$ 1,517
Guangzhou Factory | Disposed of by sale
Restructuring Cost and Reserve [Line Items]
Consideration	¥ 320	47,200		47,200
Period to cease operations (up to)	24 months
Expected term of completion	28 months
Escrow deposit as percentage of purchase price	10.00%
Employee severance | Manufacturing activities transition
Restructuring Cost and Reserve [Line Items]
Additional restructuring expenses expected to be incurred		1,500		1,500
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				$ 5,700	$ 1,500

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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