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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2015
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 and six months ended June 30, 2015 and 2014 (in thousands):
 
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2015
  
2014
  
2015
  
2014
 
         
Beginning accrued warranty and related costs
 
$
392
  
$
1,227
  
$
802
  
$
1,048
 
Accruals for warranties issued
  
411
   
81
   
585
   
577
 
Adjustments related to pre-existing warranties including expirations and changes in estimates
  
42
   
(199
)
  
(252
)
  
(302
)
Cost of warranty repair
  
(177
)
  
(129
)
  
(467
)
  
343
 
Ending accrued warranty and related costs
 
$
668
  
$
980
  
$
668
  
$
980
 
Outstanding contractual obligations
Outstanding contractual obligations as of June 30, 2015 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
 
$
639
  
$
222
  
$
258
  
$
54
  
$
105
 
Royalty agreement
  
2,125
   
688
   
1,150
   
287
   
—
 
Total
 
$
2,764
  
$
910
  
$
1,408
  
$
341
  
$
105