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Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Summary of Composition of Debt

The following table presents the composition of debt as of September 30, 2018 and December 31, 2017 (in thousands):

 

 

September 30,

2018

 

 

December 31,

2017

 

Outstanding principal

 

$

30,000

 

 

$

30,000

 

Accrued final payment fees

 

 

1,377

 

 

 

940

 

Less debt discounts

 

 

(1,179

)

 

 

(1,384

)

Total long-term debt, net

 

 

30,198

 

 

 

29,556

 

Less current portion of long-term debt

 

 

(5,000

)

 

 

-

 

Long-term debt, net

 

$

25,198

 

 

$

29,556

 

 

Summary of Future Principal Payments

Based on a 36-month amortization of the outstanding principal amounts of the Term A and Term B Loans beginning on April 1, 2019 as discussed above, the following table sets forth by year the Company’s required future principal payments (in thousands):

Year:

 

Principal

Payments

 

2018

 

$

-

 

2019

 

 

7,500

 

2020

 

 

10,000

 

2021

 

 

10,000

 

2022

 

 

2,500

 

Total principal payments

 

$

30,000