Term Loan (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Outstanding Loan and Unamortized Debt Discount Balances

The outstanding loan and unamortized debt discount balances as of December 31, 2018 in accordance with the repayment terms under Amended and Restated Loan Agreement are as follows:

	December 31,
	2018			2017
Term loan	$	15,500		$	7,000
Less: unamortized discount on loan		(600	)		(203	)
Less: current portion		—			(700	)
Accrued portion of final payment fee		114			7
Loan payable, long-term	$	15,014		$	6,104

Schedule of Principal Payments on Outstanding Debt

Scheduled principal payments on outstanding debt as of December 31, 2018, excluding the final payment fee of $1,008, are as follows:

2019	$	—
2020		5,167
2021		6,200
2022		4,133
Total	$	15,500