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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Convertible Debt
At June 30, 2018 and December 31, 2017, the net carrying value of the debt and the remaining unamortized debt discounts and debt issuance costs were as follows (in thousands):

 
June 30, 2018
 
December 31, 2017
 
(Unaudited)
 
(Audited)
Face amount of the 2019 Notes (non-current due December 2019)
$
68,660

 
$
143,750

Face amount of the 2021 Loan (non-current due June 2021)
15,000

 
—

Face amount of the 2023 Notes (non-current due May 2023)
75,090

 
—


158,750

 
143,750

Less unamortized discounts and debt issuance costs
28,871

 
22,773

   Total Carrying Value, Net
$
129,879

 
$
120,977
Schedule of Debt Expense
For the six months ended June 30, 2018 and 2017, the Company recorded the following expenses in relation to the debt (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Interest expense of the 2019 Notes (1)
$
878

 
$
1,347

 
$
2,226

 
$
2,695

Interest expense of the 2021 Loan
141

 
—

 
141

 
—

Interest expense of the 2023 Notes (1)
634

 
—

 
634

 
—

Debt partial extinguishment of 2019 Notes
2,467

 
—

 
2,467

 
—

Debt discount amortization of the 2019 Notes (1)
1,571

 
2,126

 
3,910

 
4,183

Debt discount amortization of the 2021 Loan
14

 
—

 
14

 
—

Debt discount amortization of the 2023 Notes (1)
498

 
—

 
498

 
—

Debt financing amortization of the 2019 Notes (1)
191

 
232

 
446

 
456

Debt financing amortization of the 2021 Loan
17

 
—

 
17

 
—

Debt financing amortization of the 2023 Notes (1)
42

 
—

 
42

 
—

   Interest expense
$
6,453

 
$
3,705

 
$
10,395

 
$
7,334



(1) Included within "Interest and other expense, net" on the Condensed Consolidated Statements of Operations, offset by interest income and capitalized interest, as disclosed Note 6.