Accounts Payable and Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]  
Accounts Payable and Accrued Expenses / Costs
Accounts payable and accrued expenses consist of the following at December 31, 2016 and 2015 (in thousands):
 
 
2016
 
2015
 
 
 
 
 
Payroll and other employee benefits
 
$
1,593

 
$
576

Accrued vacation
 
533

 
701

Accrued legal expenses - patent
 
6,564

 
10,135

Foreign taxes payable (1)
 
3,150

 
3,960

Accrued consulting and other professional fees
 
1,967

 
1,592

Other accrued liabilities
 
476

 
383

 
 
$
14,283

 
$
17,347

(1) - Included in "Accounts payable and accrued expenses / patent costs" line item on the consolidated statement of cash flows included elsewhere herein.