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Other Current Liabilities
 6 Months Ended
Jun. 30, 2014
Text Block [Abstract]  
Other Current Liabilities
Other Current Liabilities
Other current liabilities consist of the following (in thousands):
 
June 30, 2014
 
December 31, 2013
Customer incentives
$
2,792

 
$
3,068

Unearned grant revenue
723

 
2,029

Accrued research and development costs
287

 
240

Other
1,755

 
2,303

Total other current liabilities
$
5,557

 
$
7,640