Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at balance sheet date	$ (306)	$ (550)
Other comprehensive income (loss) before reclassifications	6	(599)
Amounts reclassified from accumulated other comprehensive loss	3	0
Total changes in other comprehensive loss	9	(599)
Balance at balance sheet date	(297)	(1,149)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at balance sheet date	(325)	(745)
Other comprehensive income (loss) before reclassifications	72	(610)
Amounts reclassified from accumulated other comprehensive loss	0	0
Total changes in other comprehensive loss	72	(610)
Balance at balance sheet date	(253)	(1,355)
Unrealized Holding Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at balance sheet date	42	195
Other comprehensive income (loss) before reclassifications	(27)	11
Amounts reclassified from accumulated other comprehensive loss	0	0
Total changes in other comprehensive loss	(27)	11
Balance at balance sheet date	15	206
Unrealized Gains (Losses) on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at balance sheet date	(23)	0
Other comprehensive income (loss) before reclassifications	(39)	0
Amounts reclassified from accumulated other comprehensive loss	3	0
Total changes in other comprehensive loss	(36)	0
Balance at balance sheet date	$ (59)	$ 0