Cash and Cash Equivalents and Restricted Time Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 26,928	$ 26,169	$ 9,817
Certificate of deposit	5,170	5,190
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	22,400	21,600
Foreign [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	4,500	4,600
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	$ 5,000	$ 5,000