Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	$ 2,436	$ 2,590
Other comprehensive (loss) income before reclassifications	124	(30)
Net current-period other comprehensive income	124	(30)
Balance at the end of the period	2,560	2,560
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	(160)	9
Other comprehensive (loss) income before reclassifications	124	(45)
Net current-period other comprehensive income	124	(45)
Balance at the end of the period	(36)	(36)
Foreign Currency Items
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	2,596	2,581
Other comprehensive (loss) income before reclassifications		15
Net current-period other comprehensive income		15
Balance at the end of the period	$ 2,596	$ 2,596