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Debt Obligations - (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Obligations [Abstract]  
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 six months ended June 30, 2017 and June 30, 2016:
 
Three Months Ended June 30,
 
Six Months Ended June 30,

2017
 
2016
 
2017
 
2016
Contractual interest coupon
$
—

 
$
563

 
$
—

 
$
1,125

Amortization of interest discount
—

 
899

 
—

 
1,793

Amortization of debt issuance costs
—

 
123

 
—

 
246

     Total interest cost recognized
$
—

 
$
1,585

 
$
—

 
$
3,164