Term Loan (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Outstanding Loan and Unamortized Debt Discount Balances

     The outstanding loan and unamortized debt discount balances as of June 30, 2019 in accordance with the repayment terms under the Amended and Restated Loan Agreement are as follows:

	June 30,			December 31,
	2019			2018
Term loan	$	15,500		$	15,500
Less: unamortized discount on loan		(487	)		(600	)
Less: current portion		(2,067	)		—
Accrued portion of final payment fee		256			114
Loan payable, long-term	$	13,202		$	15,014

Schedule of Principal Payments on Outstanding Debt

Scheduled principal payments on outstanding debt as of June 30, 2019 by calendar year, excluding the final payment fee of $1,008, are as follows:

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