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Accrued Liabilities (Tables)
6 Months Ended
Jun. 30, 2015
Accrued Liabilities [Abstract]  
Components of accrued liabilities
The components of accrued liabilities are summarized below (in thousands):
 
  
June 30,
2015
  
December 31,
2014
 
Accrued compensation and related charges
 
$
1,694
  
$
2,656
 
Current portion of royalty payments
  
688
   
800
 
Accrued product warranty
  
668
   
802
 
Accrued professional services
  
418
   
509
 
Dividends payable by consolidated joint ventures
  
566
   
563
 
Accrued income taxes
  
279
   
119
 
Other accrued liabilities
  
1,730
   
2,185
 
  
$
6,043
  
$
7,634