Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Measurements

Summary of assets and liabilities measured fair value on a recurring basis

	As of December 31, 2022
	Quoted Prices		Significant		Significant
	in Active		Observable		Unobservable
	Markets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Cash and cash equivalents:
Money market funds	$	1,944	$	—	$	—	$	1,944
Short term investments
Corporate debt securities		—		16,445		—		16,445
Yankee securities		—		1,999		—		1,999
Bonds		—		2,988		—		2,988
Treasury bill		5,980		—		—		5,980
Reverse repurchase agreements		—		178,500		—		178,500
Total	$	7,924	$	199,932	$	—	$	207,856

	As of December 31, 2021
	Quoted Prices		Significant		Significant
	in Active		Observable		Unobservable
	Markets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Cash equivalents:
Money market funds	$	1,853	$	—	$	—	$	1,853
Short-term investments:
Reverse repurchase agreements		—		39,000		—		39,000
Total	$	1,853	$	39,000	$	—	$	40,853

Summary of warrant liability was valued based on significant inputs not observable in the market, which represents a Level 3

	December 31, 2021
Balance at beginning of year	$	—
Issuance of warrants		4,332
(Decrease) increase in the fair value of the warrants		(864)
Reclassification of warrant liability to additional paid in-capital		(3,468)
Ending balance	$	—

Schedule of fair value of the warrants

	Year Ended December 31,
	2021
Weighted-average expected volatility	89.1-89.3	%
Expected term (in years)	9.54-9.88
Risk-free interest rate	1.064-1.725	%
Expected dividend yield	0	%