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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Financial Instruments [Abstract] |
Gains (Losses) Related to Derivative Instruments Not Designated as Hedging Instruments | The following table summarizes gains (losses) related to derivative instruments not designated as hedging instruments during the years ended December 31, 2015, 2016 and 2017 (U.S. dollars in thousands):
|  |  | Amount of Gain (Loss) Recognized in Income |
|  |  | Year Ended December 31, |
Derivatives not designated as hedging instruments: | Location of Gain (Loss) Recognized in Income |  | 2015 |  |  | 2016 |  |  | 2017 |
Foreign currency contracts | Other income (expense) |  | $ | 38 |  |  | $ | 39 |  |  | $ | (485 | )
Gains (Losses) Related to Derivative Instruments Designated as Cash Flow Hedges | The following table summarizes gains (losses) related to derivative instruments recorded in other comprehensive income (loss) during the years ended December 31, 2015, 2016 and 2017 (U.S. dollars in thousands):
|  | Amount of Gain (Loss) Recognized in Other Comprehensive Loss |
|  | Year Ended December 31, |
Derivatives designated as hedging instruments: |  | 2015 |  |  | 2016 |  |  | 2017 |
Foreign currency forward contracts related to intercompany license fee, product sales, and selling expense hedges |  | $ | 590 |  |  | $ | (1,423 | ) |  | $ | (152 | )
The following table summarizes gains (losses) relating to derivative instruments reclassified from accumulated other comprehensive loss into income during the years ended December 31, 2015, 2016 and 2017 (U.S. dollars in thousands):
|  |  | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income |
|  |  | Year Ended December 31, |
Derivatives designated as hedging instruments: | Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income |  | 2015 |  |  | 2016 |  |  | 2017 |
Foreign currency forward contracts related to intercompany license fees and product sales hedges | Revenue |  | $ | 1,731 |  |  | $ | (1,088 | ) |  | $ | 119 |
Foreign currency forward contracts related to intercompany selling expense hedges | Selling expenses |  | $ | 397 |  |  | $ | (1,544 | ) |  | $ | 358 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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