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Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Borrowings

Borrowings consist of the following (in thousands):

		December 31,
		2016				2015
Facility Financing Obligation (2019 Notes)
Principal amount		$	75,000			$	80,000
Unamortized debt discount			(3,661	)			(5,418	)
Net carrying amount		$	71,339			$	74,582
Senior Convertible Notes (2018 Notes)
Principal amount		$	27,690			$	27,690
Unamortized premium			426				660
Unaccreted debt issuance costs			(481	)			(737	)
Net carrying amount		$	27,635			$	27,613
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 Deerfield financing during the years ended December 31, 2016, 2015 and 2014 are as follows (in thousands):

		December 31,
		2016				2015				2014
Accretion expense — debt issuance cost		$	35			$	35			$	326
Accretion expense — debt discount		$	1,722			$	1,553			$	7,550

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