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Borrowings (Tables)
3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Summary of Borrowings

Borrowings consist of the following (in thousands):

 

 

 

March 31, 2018

 

 

December 31, 2017

 

Facility Financing Obligation (2019 Notes and Tranche B Notes)

 

 

 

 

 

 

 

 

Principal amount

 

$

45,000

 

 

$

54,407

 

Unamortized debt issuance costs and debt discount

 

 

(1,346

)

 

 

(1,662

)

Net carrying amount

 

$

43,654

 

 

$

52,745

 

Senior Convertible Notes (2021 Notes)

 

 

 

 

 

 

 

 

Principal amount

 

$

23,690

 

 

$

23,690

 

Unamortized premium

 

 

678

 

 

 

721

 

Net carrying amount

 

$

24,368

 

 

$

24,411

 

Note payable to related party - net carrying amount

 

$

72,247

 

 

$

79,666

 

 

 

 

 

 

 

 

 

 

Total debt - net carrying amount

 

$

140,269

 

 

$

156,822

 

 

Accretion of Debt Issuance Cost and Debt Discount

Accretion of debt issuance cost and debt discount during the three months ended March 31, 2018 and 2017, are as follows (in thousands):

 

 

 

Three Months Ended March 31,

 

 

 

2018

 

 

2017

 

Accretion expense - debt issuance cost

 

$

6

 

 

$

9

 

Accretion expense - debt discount

 

$

310

 

 

$

447

 

 

Schedule of Amortization of Premium and Accretion of Debt Issuance Costs

Amortization of the premium and accretion of debt issuance costs related to the 2021 and 2018 notes for the three months ended March 31, 2018 and 2017 are as follows:

 

 

 

Three Months Ended March 31,

 

 

 

2018

 

 

2017

 

Amortization of debt premium

 

$

43

 

 

$

59

 

Accretion expense - debt issuance cost

 

 

 

 

$

66