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Interest Expense (Tables)
12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Summary of Interest Expense by Cash and Non-Cash Components
The interest expense by cash and non-cash components is as follows (in thousands):
 
 
Year Ended December 31,
 
2014
 
2013
 
2012
Interest expense
 
 
 
 
 
Cash related interest expense (1)
$
(1,182
)
 
$
(1,590
)
 
$
(2,302
)
 
 
 
 
 
 
Non-cash interest expense
 
 
 
 
 
Non-cash interest expense — debt issuance costs
(203
)
 
(490
)
 
(300
)
Non-cash interest expense — warrant and derivative related debt discounts
(650
)
 
(4,128
)
 
(7,427
)
Non-cash interest expense — convertible notes
(1,250
)
 
(9,409
)
 
(18,930
)
Loss on extinguishment of 2013 Notes
(8,331
)
 

 

Effective interest on financing obligation
(28
)
 

 

Capitalized interest expense (2)
972

 
453

 

Total non-cash interest expense
(9,490
)
 
(13,574
)
 
(26,657
)
 
 
 
 
 
 
Total interest expense
$
(10,672
)
 
$
(15,164
)
 
$
(28,959
)
 
(1)
Cash related interest expense included interest payments to Hercules Notes Payable and Essex Notes.
(2)
Interest expense capitalized pursuant to Accounting Standards Codification Topic 835, Interest.