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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2014
Commitments and Contingencies [Abstract]  
Product warranty accrued liability
The following table reflects the change in our warranty accrual which is included in "accrued liabilities" on the condensed consolidated balance sheets, during the three months ended March 31, 2014 and 2013 (in thousands):
 
 
 
Three Months Ended
March 31,
 
 
 
2014
  
2013
 
 
 
  
 
Beginning accrued warranty and related costs
 
$
1048
  
$
588
 
Accruals for warranties issued
  
496
   
264
 
Adjustments related to pre-existing warranties including expirations and changes in estimates
  
(103
)
  
166
 
Cost of warranty repair
  
(214
)
  
(269
)
Ending accrued warranty and related costs
 
$
1,227
  
$
749
 
Outstanding contractual obligations
Outstanding contractual obligations as of March 31, 2014 are summarized as follows (in thousands):

 
 
Payments due by period
 
Contractual Obligations
 
Total
  
Less than 1 year
  
1-3
years
 
4-5
years
 
More than
5 years
 
Operating leases
 
  
$
557
  
  
$
263
  
  
$
208
  
$
34
  
$
52
 
Royalty agreement
  
3,125
   
800
   
1,319
   
1,006
   
—
 
Total
     
$
3,682
      
$
1,063
      
$
1,527
  
$
1,040
  
$
52