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Long-term Debt (Tables)
6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of long-term debt and unamortized debt discount balances
Long-term debt and unamortized debt discount balances are as follows (in thousands):
 
June 30, 2017
Loans payable, gross
$
35,000

Less: Unamortized debt discount and issuance costs
(1,888
)
Plus: Unpaid portion of quarterly interest payment
656

Carrying value of loans payable
33,768

Less: Current portion of long-term debt
—

Non-current portion of long-term debt
$
33,768