Fair Value Measurements

3 Months Ended

Mar. 31, 2021

4. Fair Value Measurements

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):

		March 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	$	50,147	$	—	$	—		$	50,147
Short-term investments:
Commercial paper	Level 2		13,286		—		—			13,286
Corporate debt	Level 2		10,416		—		(6	)		10,410
Yankee debt securities	Level 2		2,023		—		(2	)		2,021
Total cash equivalents and short-term investments		$	75,872	$	—	$	(8	)	$	75,864

		December 31, 2020
	Valuation Hierarchy	Amortized Costs		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Aggregate Fair Value
Assets:
Cash equivalents:
Money market funds	Level 1	$	56,056	$	—	$	—	$	56,056
Short-term investments:
U.S. Treasury securities	Level 1		14,999		1		—		15,000
Corporate debt	Level 2		4,898		—		—		4,898
Total cash equivalents and short-term investments		$	75,953	$	1	$	—	$	75,954

As of March 31, 2021, the remaining contractual maturities for available-for-sale securities were less than one year.

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. There were no unrealized losses for securities in an unrealized loss position for more than 12 months as of March 31, 2021. During the three months ended March 31, 2021 and 2020, the Company did not recognize other-than-temporary impairment losses related to its short-term investments.

- 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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