Fair Value Measurements

3 Months Ended

Mar. 31, 2023

The fair value of our financial assets measured on a recurring basis is as follows:


	March 31, 2023
	Level I		Level II		Total
Cash and cash equivalents:
Cash	$	19,689	$	—	$	19,689
Money market funds	1,183		—		1,183


Total Cash and cash equivalents	$	20,872	$	—	$	20,872
Marketable securities:
U.S. treasury securities	$	469,873	$	—	$	469,873

Commercial paper	—		121,808		121,808
Total Marketable securities	$	469,873	$	121,808	$	591,681


	December 31, 2022
	Level I		Level II		Total
Cash and cash equivalents:
Cash	$	95,117	$	—	$	95,117
Money market funds	45,655		—		45,655


Total Cash and cash equivalents	$	140,772	$	—	$	140,772

Marketable securities:
U.S. treasury securities	$	549,124	$	—	$	549,124
Corporate debt securities	—		35,207		35,207
Commercial paper	—		139,131		139,131
Total Marketable securities	$	549,124	$	174,338	$	723,462

The Company classifies its highly liquid money market funds and U.S. treasury securities within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its commercial paper and corporate debt securities within Level 2 because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security which may not be actively traded. The Company had no Level 3 financial assets as of March 31, 2023 and December 31, 2022.

Financial Instruments Not Recorded at Fair Value on a Recurring Basis

The Company reports financial instruments at fair value, with the exception of the 0% Convertible Senior Notes due December 1, 2026 (“Convertible Notes”). Financial instruments that are not recorded at fair value on a recurring basis are measured at fair value on a quarterly basis for disclosure purposes. The carrying values and estimated fair values of financial instruments not recorded at fair value are as follows:


	March 31, 2023				December 31, 2022
	Carrying Value		Fair Value		Carrying Value		Fair Value
Convertible Notes	$	1,472,148	$	1,175,280	$	1,470,270	$	1,134,030

The carrying value of the Convertible Notes as of March 31, 2023 and December 31, 2022 was net of unamortized debt issuance costs of $27,852 and $29,730, respectively.

The total fair value of the Convertible Notes was determined based on the closing trading price as of the last day of trading for the period. The Company considers the fair value to be a Level 2 valuation due to the limited trading activity.

- 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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