Selected Balance Sheet Detail (Tables)

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property and equipment consisted of the following (in thousands):

Property and equipment consisted of the following (in thousands):

	March 31,			December 31,
	2022			2021
Laboratory equipment	$	584		$	584
Computer hardware and software		100			82
		684			666
Accumulated depreciation and amortization		(565	)		(549	)
Property and equipment, net	$	119		$	117

Contract liabilities which are included in accrued expenses consisted of the following (in thousands):

Contract liabilities which are included in accrued expenses consisted of the following (in thousands):

Beginning balance as of December 31, 2021	$	335
Consideration received in advance of revenue recognition		—
Revenue recognized		—
Ending balance as of March 31, 2022	$	335

A summary of activity of our warranty liabilities, which are included in accrued expenses, for the period ended March 31, 2022 is presented below

A summary of activity of our warranty liabilities, which are included in accrued expenses, for the period ended March 31, 2022 is presented below:

Beginning balance as of December 31, 2021	$	50
Additions		—
Settlements		—
Adjustments and other		—
Ending balance as of March 31, 2022	$	50

Schedule of right of use assets and operating lease liabilties

Assets	Classification	March 31, 2022		December 31, 2021
Non-current assets	Right-of-use assets	$	184	$	228
Liabilities
Current	Current operating lease liabilities	$	199	$	185
Long term	Long term operating lease liabilities	$	—	$	52

The components of lease expense for the three months ended March 31, 2022 and 2021 were as follows (unaudited):

The components of lease expense for the three months ended March 31, 2022 and 2021 were as follows (unaudited):

	For the three months ended March 31, 2022		For the three months ended March 31, 2021
Lease expense:
Operating lease expense	$	49	$	22
Short-term lease expense		—		—
Total lease expense	$	49	$	22