Cash and Cash Equivalents and Restricted Time Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 24,810	$ 26,169	$ 10,656
Certificate of deposit	5,168	5,190
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	20,900	21,600
Foreign [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	3,900	4,600
Restricted Time Deposits [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	5,200	5,200
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	$ 5,000	$ 5,000