Leases (Tables)

12 Months Ended

Dec. 31, 2021

Leases

Summary of presentation of operating leases in consolidated balance sheets

		December 31,
	Balance Sheet Classification	2021		2020
		(in thousands)
Assets:
Operating lease assets	Right-of-use asset, net	$	169	$	182
Liabilities:
Current portion of operating lease liabilities	Current portion of operating lease liabilities		110		107
Operating lease liabilities, net of current portion	Operating lease liabilities, net of current portion		59		75
Total operating lease liabilities		$	169	$	182

Schedule of Weighted average discount rate and lease term

The weighted average remaining lease terms and weighted average discount rates as of December 31, 2021 and 2020 were as follows:

	Year ended December 31,
	2021		2020
Remaining lease term (in years)	1.60		1.92
Discount rate	9.14	%	10.16	%

Summary of lease expense categories in consolidated statements of operations

		For the Year Ended December 31,
		2021		2020
		(in thousands)
Operating lease expense	Research and development	$	77	$	77
	General and administrative		44		44
	Total	$	121	$	121

Summary of minimum lease payments for the next five years and thereafter

The minimum lease payments for the next five years and thereafter are as follows:

	As of
	December 31, 2021
	(in thousands)
2022	$	121
2023		55
2024		7
2025		—
Total lease payments		183
Less: imputed interest		14
Present value of operating lease liabilities	$	169