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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2014
Restructuring Costs [Abstract]  
Summary of changes in restructuring accrual
The following table summarizes the activity in the restructuring accrual during the periods presented (in thousands):
 
Q1 2012 Restructuring Plan
 
Q3 2012 Restructuring Plan
 
Q4 2013 Restructuring Plan
 
Total
Restructuring charges
$
572

 
$
2,537

 
$
—

 
$
3,109

Cash payments
(512
)
 
(611
)
 
—

 
(1,123
)
Leasehold improvements write-down and equipment disposal charges
—

 
(1,413
)
 
—

 
(1,413
)
Adjustments to previously accrued charges
(60
)
 
(93
)
 
—

 
(153
)
Balance at December 31, 2012
—

 
420

 
—

 
420

Restructuring charges
—

 

 
809

 
809

Cash payments
—

 
(345
)
 
(532
)
 
(877
)
Non-cash items
—

 
(49
)
 
—

 
(49
)
Adjustments to previously accrued charges
—

 
(26
)
 
—

 
(26
)
Balance at December 31, 2013
—

 
—

 
277

 
277

Cash payments
—

 
—

 
(238
)
 
$
(238
)
Adjustments to previously accrued charges
—

 
—

 
(39
)
 
$
(39
)
Balance at December 31, 2014
$
—

 
$
—

 
$
—

 
$
—