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Derivatives - Details of Foreign Currency Exchange Contracts Held (Details) - Not designated as hedging instrument | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / € ¥ / $ $ / R$ | Dec. 31, 2017 USD ($) $ / € ¥ / $ $ / R$
Euro |  |
Derivative [Line Items] |  |
Notional value | $ 20,000,000 | $ 17,000,000.0
Forward rate | $ / € | 1.1421 | 1.1858
Unrealized gain (loss) recorded at balance sheet date | $ (97,000) | $ (220,000)
Chinese Yuan |  |
Derivative [Line Items] |  |
Notional value |  | $ 20,000,000.0
Forward rate | ¥ / $ |  | 6.6481
Unrealized gain (loss) recorded at balance sheet date |  | $ (410,000)
Chinese Yuan | USD/Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value | $ 27,000,000 |
Forward rate | ¥ / $ | 6.8969 |
Unrealized gain (loss) recorded at balance sheet date | $ (116,000) |
Chinese Yuan | USD/Chinese Yuan |  |
Derivative [Line Items] |  |
Notional value | $ 5,000,000 |
Forward rate | ¥ / $ | 6.9245 |
Unrealized gain (loss) recorded at balance sheet date | $ (41,000) |
Brazilian Real |  |
Derivative [Line Items] |  |
Notional value | $ 1,000,000 | $ 2,500,000.0
Forward rate | $ / R$ | 3.8651 | 3.2350
Unrealized gain (loss) recorded at balance sheet date | $ 5,000 | $ 65,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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