March 31,

December 31,

2017

2016

Convertible Notes

$

172,500

$

172,500

Unaccreted discount on Convertible Notes

(15,812)

(17,149)

Unamortized issuance costs on Convertible Notes

(2,542)

(2,776)

Convertible Notes carrying value

$

154,146

$

152,575

Term Notes

$

108,138

$

142,000

Unamortized issuance costs on Term Notes

(2,469)

(3,665)

Term Notes carrying value

$

105,669

$

138,335

Revolving credit facility balance

$

25,000

$

 —