Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Changes in accumulated other comprehensive income (loss) by component
Amounts reclassified from other comprehensive income	$ 0	$ 0
Balance at the beginning of the period	2,748	2,668
Other comprehensive income (loss) before reclassifications	(124)	(44)
Net current-period other comprehensive income	(124)	(44)
Balance at the end of the period	2,624	2,624
Unrealized Gain (Loss) on Marketable Securities, net of tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	163	82
Other comprehensive income (loss) before reclassifications	(121)	(40)
Net current-period other comprehensive income	(121)	(40)
Balance at the end of the period	42	42
Foreign Currency Items
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	2,585	2,586
Other comprehensive income (loss) before reclassifications	(3)	(4)
Net current-period other comprehensive income	(3)	(4)
Balance at the end of the period	$ 2,582	$ 2,582