Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets and liabilities measured at fair value [Abstract]
Money market fund	$ 14,621	$ 10,553
Foreign exchange contracts - Assets	49	142
Total assets	14,670	10,695
Foreign exchange contracts - Liabilities	(319)	(655)
Total liabilities	(319)	(655)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	14,621	10,553
Foreign exchange contracts - Assets	0	0
Total assets	14,621	10,553
Foreign exchange contracts - Liabilities	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	0	0
Foreign exchange contracts - Assets	49	142
Total assets	49	142
Foreign exchange contracts - Liabilities	(319)	(655)
Total liabilities	(319)	(655)
Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	0	0
Foreign exchange contracts - Assets	0	0
Total assets	0	0
Foreign exchange contracts - Liabilities	0	0
Total liabilities	$ 0	$ 0