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RESTRUCTURING AND OTHER CHARGES (Tables)
 12 Months Ended
Dec. 31, 2014
Restructuring Charges [Abstract]  
Summary of Changes in Restructuring Accrual
The following table summarizes changes in our restructuring accrual for the years ended December 31, 2014, 2013 and 2012 (in thousands):
 
Employee
Severance
Costs
 
Contract
Termination
Costs
 
Other
Costs
 
Total
Balance at December 31, 2011
$
82

 
$
2,661

 
$
—

 
$
2,743

Restructuring charges (1)
4,011

 
355

 
704

 
5,070

Payments
(2,190
)
 
(1,420
)
 
(474
)
 
(4,084
)
Write-off of long-term assets (1)
—

 
—

 
(230
)
 
(230
)
Reserve adjustments
102

 
4

 
—

 
106

Balance at December 31, 2012
2,005

 
1,600

 
—

 
3,605

Restructuring charges
2,413

 
825

 
424

 
3,662

Payments
(4,406
)
 
(1,322
)
 
(399
)
 
(6,127
)
Reserve adjustments
(12
)
 
—

 
(25
)
 
(37
)
Balance at December 31, 2013
—

 
1,103

 
—

 
1,103

Restructuring charges
506

 
(94
)
 
—

 
412

Payments
(358
)
 
(739
)
 
—

 
(1,097
)
Reserve adjustments
(20
)
 
(32
)
 
—

 
(52
)
Balance at December 31, 2014
$
128

 
$
238

 
$
—

 
$
366

(1) During 2012, we recorded a $0.2 million charge related to impairment of property and equipment resulting from the transfer of our research, development and prototype production of the Millios system to our facility in Dornstadt, Germany and the consolidation of global manufacturing in our facility in Fremont, California.