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Borrowings (Tables)

3 Months Ended

Mar. 31, 2017

Summary of Borrowings

Borrowings consist of the following (in thousands):

		March 31, 2017				December 31, 2016
Facility Financing Obligation (2019 Notes)
Principal amount		$	75,000			$	75,000
Unamortized debt discount			(3,205	)			(3,661	)
Net carrying amount		$	71,795			$	71,339
Senior Convertible Notes (2018 Notes)
Principal amount		$	27,690			$	27,690
Unamortized premium			367				426
Unaccreted debt issuance costs			(415	)			(481	)
Net carrying amount		$	27,642			$	27,635
Note payable to principal stockholder - net carrying amount		$	49,521			$	49,521

Accretion of Debt Issuance Cost and Debt Discount

Accretion of debt issuance cost and debt discount in connection with the Facility Agreement during the three months ended March 31, 2017 and 2016 are as follows (in thousands):

		Three Months Ended March 31,
		2017				2016
Accretion expense - debt issuance cost		$	9			$	9
Accretion expense - debt discount		$	447			$	419

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Tabular disclosure of assets and liabilities, classified as other.

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