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Debt Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Obligations [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
The following table reflects the net carrying value of the Notes as of December 31, 2012 and 2013:
 
December 31,

2012

2013
Convertible senior notes
$
60,000


$
60,000

Less: Unamortized interest discount
10,990


8,249

     Net carrying value of convertible senior notes
$
49,010


$
51,751
Interest cost recognized on the convertible senior notes [Table Text Block]
The following table presents the amount of interest cost recognized relating to the Notes during the years ended December 31, 2011, 2012 and 2013.
 
December 31,

2011
 
2012

2013
Contractual interest coupon
$
999

 
$
2,251

 
$
2,250

Amortization of interest discount
1,031

 
2,486

 
2,740

Amortization of debt issuance costs
98

 
250

 
303

     Total interest cost recognized
$
2,128

 
$
4,987

 
$
5,293