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Debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt consisted of the following (in thousands):


		March 31, 2016
		Principal				Unamortized Discount				Total
Loan and Security Agreement		$	20,000			$	(172	)		$	19,828
Less: debt—current			(4,615	)			88				(4,527	)

Debt—non-current		$	15,385			$	(84	)		$	15,301


		December 31, 2015
		Principal				Unamortized Discount				Net Carrying Value
Loan and Security Agreement		$	20,000			$	(196	)		$	19,804
Less: debt—current			(3,050	)			94				(2,956	)

Debt—non-current		$	16,950			$	(102	)		$	16,848

Expected Principal and Interest Payments on Debt

Principal and interest payments on debt at March 31, 2016, are expected to be as follows * (in thousands):


Year ended December 31,		Principal				Interest				Total
2016		$	3,050			$	1,003			$	4,053
2017			6,428				980				7,408
2018			6,892				517				7,409
2019			3,630				1,474				5,104

Total		$	20,000			$	3,974			$	23,974

*	Unless interest only period extends to December 31, 2016, as described below.