Debt Facility (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary of Components of Debt Facility Carrying Value

The following table summarizes the components of the debt facility carrying value.  

	As of December 31, 2016					As of December 31, 2015
	Short-Term		Long-Term			Short-Term		Long-Term
Potential prepayment to lender	$	—	$	—		$	10,000	$	—
Principal payments to lender and end of term charge		1,521		2,538			874		4,839
Accrued interest		27		—			117		—
Debt issuance costs		—		(180	)		—		(776	)
Debt discount related to warrants		—		(73	)		—		(337	)
Carrying value	$	1,548	$	2,285		$	10,991	$	3,726

Future Minimum Payments

Future minimum payments under the debt facility are as follows:

Year Ending December 31,
	2017	$	1,776
	2018		1,776
	2019		865
	Total future minimum payments		4,417
	Unamortized interest		(331	)
	Debt issuance costs and debt discount		(253	)
	Total minimum payment		3,833
	Short-term portion		(1,548	)
	Long-term debt facility	$	2,285