Note 3 - Fair Value Measurements

3 Months Ended

Mar. 31, 2023

Notes to Financial Statements

Fair Value Disclosures [Text Block]

3. Fair Value Measurements

The following tables represent the Company’s financial assets that are measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	Fair Value Measurements as of March 31, 2023 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	51,959	$	—	$	51,959
Commercial paper		49,676		—		—		49,676
Certificates of deposit		—		26,807		—		26,807
U.S. government treasuries		11,523		—		—		11,523
Asset-backed securities		—		8,178		—		8,178
Cash equivalents		994		—		—		994
Total assets	$	62,193	$	86,944	$	—	$	149,137

	Fair Value Measurements as of December 31, 2022 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
Assets
Corporate bonds	$	—	$	87,760	$	—	$	87,760
Commercial paper		37,682		—		—		37,682
Certificates of deposit		—		19,667		—		19,667
Asset-backed securities		—		6,554		—		6,554
Cash equivalents		9,438		—		—		9,438
Total assets	$	47,120	$	113,981	$	—	$	161,101