Facility Lease (Tables)

12 Months Ended

Dec. 31, 2019

Facility Lease

Elements of lease expense

The elements of lease expense were as follows (in thousands):

	Statements of operations and	Year Ended December 31,
	comprehensive loss location	2019		2018		2017
Costs of operating lease
Operating lease costs	Research and development, General and administrative	$	960	$	748	$	734
Costs of non-lease components (previously common area maintenance)	Research and development, General and administrative		324		296		281
Total operating lease cost		$	1,284	$	1,044	$	1,015
Other Information
Operating cash flows used for operating lease		$	1,449	$	1,389	$	1,398
Remaining lease term			3.1 years		4.1 years		3.1 years
Discount rate			10.0%		—		—

Minimum rental commitments

As of December 31, 2019, minimum rental commitments under this lease were as follows (in thousands)

Year Ended December 31 (in thousands)
2020	$	1,159
2021		1,260
2022		1,299
Total lease payments		3,718
Less: imputed interest		(530)
Total	$	3,188

Schedule of future minimum lease payments under Topic 840

As of December 31, 2018, minimum rental commitments under this lease were as follows (in thousands)

Year Ended December 31 (in thousands)
2019	$	1,110
2020		1,142
2021		1,251
2022		1,296
2023		109
Total	$	4,908