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Cash and Cash Equivalents and Restricted Cash (Details) $ in Thousands, ¥ in Millions	Feb. 10, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 26, 2016 CNY (¥)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 04, 2015 USD ($)
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		$ 49,695	$ 50,611		$ 49,445	$ 52,966
Restricted Cash [Abstract]
Long-term restricted cash		4,716	4,600
Disposed of by sale \| Guangzhou Factory
Restricted Cash [Abstract]
Long-term restricted cash		4,700		¥ 32
Surety bond
Restricted Cash [Abstract]
Restricted cash							$ 4,600
Return of surety bond	$ 4,600
United States
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		6,370	3,277
People's Republic of China (PRC)
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		17,225	22,142
Asia (excluding the PRC)
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		4,771	5,260
Europe
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		17,170	19,630
South America
Cash and Cash Equivalents [Line Items]
Total cash and cash equivalents		$ 4,159	$ 302