Cash and Cash Equivalents and Restricted Time Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 20,922	$ 26,169	$ 14,113
Certificate of deposit	5,277	5,190
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	15,800	21,600
Foreign [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	5,100	4,600
Restricted Time Deposits [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	5,300	5,200
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	5,000	5,000
Restricted Time Deposit [Member]
Cash and Cash Equivalents [Line Items]
Certificate of deposit	$ 300	$ 200