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Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt at June 30, 2015, consisted of the following (in thousands):


		June 30, 2015
		Principal				Unamortized Discount				Total
Loan and Security Agreement		$	20,000			$	(106	)		$	19,894
Less: debt—current			(2,568	)			45				(2,523	)

Debt—non-current		$	17,432			$	(61	)		$	17,371

Debt at December 31, 2014, consisted of the following (in thousands):


		December 31, 2014
		Principal				Unamortized Discount				Total
Loan and Security Agreement		$	10,000			$	(128	)		$	9,872
Less: debt—current			—				—				—

Debt—non-current		$	10,000			$	(128	)		$	9,872

Expected Principal and Interest Payments on Debt

Principal and interest payments on debt at June 30, 2015, are expected to be as follows * (in thousands):


Year ended December 31,		Principal				Interest				Total
2015		$	—			$	640			$	640
2016			5,226				1,231				6,457
2017			5,603				854				6,457
2018			6,007				450				6,457
2019			3,164				1,465				4,629

Total		$	20,000			$	4,640			$	24,640

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