Cash and Cash Equivalents and Restricted Time Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 19,914	$ 22,422	$ 24,533	$ 27,591
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	8,600	13,300
Foreign [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 11,300	$ 9,100