Hedging (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Gain (Loss) Reclassified to Cost of Sales, Net	$ 178,000	$ 498,000	$ 286,000
Cash Flow Hedge Gain (Loss) Reclassified To Research and Development	295,000	544,000	183,000
Cash Flow Hedge Gain (Loss) Reclassified To Selling, General and Administrative	154,000	158,000	87,000
Beginning balance of unrealized loss on forward exchange contracts	(875,000)	(765,000)	(774,000)
Other comprehensive loss before reclassifications	(504,000)	(1,310,000)	(547,000)
Amounts reclassified from other comprehensive income	627,000	1,200,000	556,000
Other comprehensive income (loss)	123,000	(110,000)	9,000
Ending balance of unrealized loss on forward exchange contracts	(752,000)	(875,000)	(765,000)
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	627,000	1,200,000	556,000
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	14,193,000	15,328,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(500,000)
Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0	0
Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value		(169,000)
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of New Instruments During Period	0	0
Derivative, New Instruments During Period, Notional Amount	11,600,000	12,800,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	$ (83,000)