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Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Convertible Notes
As of September 30, 2016, and December 31, 2015, the Convertible Notes consisted of the following:
 
 
September 30,
2016
 
December 31,
2015
In thousands
 
 
 
 
Carrying value, current portion
 
$
112,656

 
$
—

Carrying value, long-term
 
—

 
111,058

Unamortized discount
 
2,344

 
3,942

Principal amount
 
$
115,000

 
$
115,000