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Cash and Cash Equivalents and Restricted Cash (Details) $ in Thousands, ¥ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 10, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 29, 2016 CNY (¥) | Sep. 04, 2015 USD ($) | Dec. 31, 2014 USD ($)
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | $ 62,438 | $ 50,611 | $ 52,966 |  |  | $ 112,521
Restricted Cash and Investments [Abstract] |  |  |  |  |  |  |
Increase in restricted cash |  | 0 | (4,797) | $ 0 |  |  |
Long-term restricted cash |  | 0 | 4,600 |  |  |  |
Guangzhou Factory | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Restricted Cash and Investments [Abstract] |  |  |  |  |  |  |
Long-term restricted cash |  | 4,900 |  |  | ¥ 32 |  |
Surety Bond |  |  |  |  |  |  |
Restricted Cash and Investments [Abstract] |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  | $ 4,600 |
Increase in restricted cash | $ 4,600 |  |  |  |  |  |
United States |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | 10,489 | 3,277 |  |  |  |
People's Republic of China (PRC) |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | 23,283 | 22,142 |  |  |  |
Asia (excluding the PRC) |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | 1,405 | 5,260 |  |  |  |
Europe |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | 18,071 | 19,630 |  |  |  |
South America |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |
Total cash and cash equivalents |  | $ 9,190 | $ 302 |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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