Accrued and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2013
Accrued and Other Current Liabilities  
Accrued And Other Current Liabilities [Table Text Block]
Accrued and other current liabilities consisted of the following (in thousands):
 
December 31,
 
2013
 
2012
Accrued payroll-related expenses
$
6,791

 
$
6,567

Accrued expenses
1,993

 
639

Total accrued liabilities
$
8,784

 
$
7,206

 
 
 
 
Patent and other assets purchased but not paid
$
563

 
$
1,100

Other current liabilities
1,075

 
713

Total other current liabilities
$
1,638

 
$
1,813