Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Value of Financial Instrument

The estimated fair values of financial instruments outstanding were (in thousands):

	June 30, 2022 (Unaudited)
			Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
Short-term investments	$	18,397	$	—	$	(30	)	$	18,367
Total	$	18,397	$	—	$	(30	)	$	18,367

	December 31, 2021
			Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
Short-term investments	$	23,040	$	—	$	(29	)	$	23,011
Total	$	23,040	$	—	$	(29	)	$	23,011

Schedule of Fair Value Hierarchy Financial Assets

The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) (in thousands):

	June 30, 2022 (Unaudited)
	Fair Value		Level 1		Level 2		Level 3
Money market funds	$	5,339	$	5,339	$	—	$	—
Corporate notes and commercial paper		18,367		—		18,367		—
Total financial assets	$	23,706	$	5,339	$	18,367	$	—

	December 31, 2021
	Fair Value		Level 1		Level 2		Level 3
Money market funds	$	5,484	$	5,484	$	—	$	—
Corporate notes and commercial paper		23,011		—		23,011		—
Total financial assets	$	28,495	$	5,484	$	23,011	$	—

Schedule of Derivative Liability Transactions

	Three Months Ending					Six Months Ending
	June 30, 2022			June 30, 2021		June 30, 2022			June 30, 2021
	(Unaudited)			(Unaudited)		(Unaudited)			(Unaudited)
Beginning Balance	$	120,000		$	362,000	$	138,000		$	383,000
Fair value upon issuance of warrants		—			—		—			—
Change in fair value	$	(5,000	)	$	480,000	$	(23,000	)	$	459,000
Extinguishment		—			—		—			—
Ending Balance	$	115,000		$	842,000	$	115,000		$	842,000