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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2013
Other Income and Expenses [Abstract]  
Schedule of Other Income (Expense)
Other Income (Expense)

Other income (expense) is summarized as follows (in thousands):
 
 
 
Year Ended December 31,
 
 
2013
 
2012
 
2011
Change in fair value of warrants potentially settleable in cash
 
$
(44,001
)
 
$
(10,775
)
 
$
8,986

Realized gain on sale of marketable securities
 
3,911

 
—

 
—

Change in fair value of the contingent purchase price liability
 
(926
)
 
(2,370
)
 
109

Miscellaneous other income
 
37

 
—

 
(9
)
Total other income (expense)
 
$
(40,979
)
 
$
(13,145
)
 
$
9,086