Fair Value Measurements

6 Months Ended

Jun. 30, 2022

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):


		June 30, 2022
	Valuation Hierarchy	Amortized Costs		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Assets:
Cash equivalents:
Money market funds	Level 1	$	31,353	$	—	$	—		$	31,353
Short-term investments:
U.S. Treasury securities	Level 1		76,950		—		(518	)		76,432
Corporate debt	Level 2		78,645		—		(437	)		78,208
Commercial paper	Level 2		31,925		—		—			31,925
Total cash equivalents and short-term investments		$	218,873	$	—	$	(955	)	$	217,918


		December 31, 2021
	Valuation Hierarchy	Amortized Costs		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Assets:
Cash equivalents:
Money market funds	Level 1	$	60,844	$	—	$	—		$	60,844
Short-term investments:
U.S. Treasury securities	Level 1		18,064		—		(60	)		18,004
Corporate debt	Level 2		124,178		2		(125	)		124,055
Commercial paper	Level 2		15,081		—		—			15,081
Total cash equivalents and short-term investments		$	218,167	$	2	$	(185	)	$	217,984

As of June 30, 2022, the remaining contractual maturities for available-for-sale securities were one month to thirteen months.

Impairment assessments are made at the individual security level at each reporting period. When the fair value of an available-for-sale security is less than its cost at the balance sheet date, a determination is made as to whether the impairment is other-than-temporary and, if it is other-than-temporary, an impairment loss is recognized in earnings equal to the difference between the investment’s amortized cost and fair value at such date. As of June 30, 2022, there were three securities with a total fair value of $18.0 million in an unrealized loss position for more than 12 months. The unrealized losses totaling $89,000 as of June 30, 2022 were caused by changes in market interest rates or the widening of market spreads subsequent to the initial purchase of these securities, and not related to the underlying credit of the issuers or the underlying collateral. These securities were issued by public reporting companies with an investment-grade rating by at least one bond credit rating agency. As a result, the Company did not consider these investments to be other-than-temporarily impaired as of June 30, 2022. During the three and six months ended June 30, 2022 and 2021, the Company did not recognize other-than-temporary impairment losses related to its investment securities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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