Fair Value Measurements

3 Months Ended

Mar. 31, 2021

The following tables summarize the fair value of financial assets and liabilities that are measured at fair value and the classification by level of input within the fair value hierarchy:


	FAIR VALUE MEASUREMENTS AS OF
	MARCH 31, 2021
(in thousands)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Cash and cash equivalents:
Cash and cash equivalents	$	122,695					$	122,695




Total cash and cash equivalents:	$	122,695	$	—	$	—	$	122,695
Investments:

Commercial paper			$	42,902			42,902
Corporate bonds			42,607				42,607

Total investments	$	—	$	85,509	$	—	$	85,509
Total cash, cash equivalents and investments:	$	122,695	$	85,509	$	—	$	208,204


	FAIR VALUE MEASUREMENTS AS OF
	DECEMBER 31, 2020
(in thousands)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Cash and cash equivalents:
Cash and cash equivalents	$	151,570	$	—	$	—	$	151,570



Total cash and cash equivalents:	$	151,570	$	—	$	—	$	151,570
Investments:

Commercial paper	$	—	$	44,104	$	—	$	44,104
Corporate bonds	—		44,690		—		44,690

Total investments	$	—	$	88,794	$	—	$	88,794
Total cash, cash equivalents and investments:	$	151,570	$	88,794	$	—	$	240,364

The fair value of the Convertible Notes, which differs from their carrying value, is influenced by interest rates, stock price and stock price volatility and is determined by prices observed in market trading. The market for trading of the Convertible Notes is not considered to be an active market and therefore the estimate of fair value is based on Level 2 inputs. The estimated fair value of the Convertible Notes was $332.9 million at March 31, 2021.

There were no transfers between the different levels of the fair value hierarchy during the three months ended March 31, 2021 and 2020.

- 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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