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Debt Obligations - (Tables)
 9 Months Ended
Sep. 30, 2014
Debt Obligations [Abstract]  
Schedule of carrying value of convertible senior notes [Table Text Block]
The following table reflects the net carrying value of the Notes:

September 30, 2014
 
December 31, 2013
Convertible senior notes
$
60,000

 
$
60,000

Less: Unamortized interest discount
6,003

 
8,249

     Net carrying value of convertible senior notes
$
53,997

 
$
51,751
Schedule of interest cost recognized on convertible senior notes [Table Text Block]
The following table presents the amount of interest cost recognized relating to the Notes during the three and nine months ended September 30, 2014 and September 30, 2013.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,

2014
 
2013
 
2014

2013
Contractual interest coupon
$
563

 
$
562

 
$
1,688

 
$
1,686

Amortization of interest discount
772

 
700

 
2,246

 
2,037

Amortization of debt issuance costs
94

 
79

 
268

 
224

     Total interest cost recognized
$
1,429

 
$
1,341

 
$
4,202

 
$
3,947