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Debt Obligations - (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Obligations [Abstract]  
Schedule of Interest Cost Recognized Relating to Notes

The following table presents the amount of interest cost recognized relating to the Notes during the years ended December 31, 2017, 2016 and 2015.

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Contractual interest coupon

 

$

—

 

 

$

1,186

 

 

$

2,250

 

Amortization of interest discount

 

 

—

 

 

 

1,893

 

 

 

3,334

 

Amortization of debt issuance costs

 

 

—

 

 

 

261

 

 

 

432

 

Total interest cost recognized

 

$

—

 

 

$

3,340

 

 

$

6,016