September 30,

December 31,

2017

2016

Convertible Notes

$

172,500

$

172,500

Unaccreted discount on Convertible Notes

(13,075)

(17,149)

Unamortized issuance costs on Convertible Notes

(2,072)

(2,776)

Convertible Notes carrying value

$

157,353

$

152,575

Term Notes

$

 —

$

142,000

Unamortized issuance costs on Term Notes

 —

(3,665)

Term Notes carrying value

$

 —

$

138,335

Revolving credit facility balance

$

101,168

$

 —