Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 14,957	$ 14,064	$ 13,178	$ 10,604
United States (including Mexico) [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	5,839	4,936
Macau S.A.R., China [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	6,101	2,517
France [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents	$ 3,017	$ 6,611