Derivative Instruments - Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income	$ (46,000)	$ 0	$ 0
Accumulated other comprehensive income (loss), net of tax \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recorded in shareholders' equity (effective portion)	32,000	104,000	0
Total gains (losses) reclassified from accumulated other comprehensive income (loss) into net income	(46,000)	0	0
Product Revenue \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	(14,000)	0	0
Research, development, and engineering expenses \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	(42,000)	0	0
Selling, general and administrative expenses \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss) into net income (effective portion)	10,000	0	0
Foreign currency gain (loss) \| Designated as Hedging Instrument [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gains (losses) recognized in net income on derivatives (ineffective portion and discontinued derivatives)	0	0	0
Foreign currency gain (loss) \| Not Designated as Hedging Instrument [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gains (losses) recognized in net income	$ 540,000	$ (193,000)	$ (722,000)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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