Term Loan (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Outstanding Loan and Unamortized Debt Discount Balances

The outstanding loan and unamortized debt discount balances are as follows:

	December 31,
	2017
Term loan	$	7,000
Less: unamortized discount on loan		(203	)
Less: current portion		(700	)
Accrued portion of final payment fee		7
Loan payable, long-term	$	6,104

Schedule of Principal Payments on Outstanding Debt

Scheduled principal payments on outstanding debt, excluding the final payment fee of $455, as of December 31, 2017, are as follows:

2018	$	700
2019		2,800
2020		2,800
2021		700
Total	$	7,000