Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other employee benefits	$ 1,593	$ 576
Accrued vacation	533	701
Accrued legal expenses - patent	6,564	10,135
Foreign taxes payable	3,150	3,960
Accrued consulting and other professional fees	1,967	1,592
Other accrued liabilities	476	383
Accounts payable and accrued expenses	$ 14,283	$ 17,347