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Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt and unamortized debt discount balances
Payment obligations under the Royalty-Backed Loan are as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
Total repayment obligation
$
200,000

 
$
200,000

Less: Interest to be accreted in future periods
(87,415
)
 
(97,353
)
Less: Payments made
(368
)
 
—

Carrying value of loans payable
$
112,217

 
$
102,647

Less: Current portion of long-term debt
(934
)
 
—

Non-current portion of long-term debt
$
111,283

 
$
102,647