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Fair Value Measurements
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements
(19) Fair Value Measurements

Fair value is the exchange price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data, or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize use of unobservable inputs. The accounting guidance for fair value measurements and disclosures establishes a three-level fair value hierarchy:

Level 1 - Inputs are based on quoted prices in active markets for identical assets and liabilities.
Level 2 - Inputs are based on observable inputs other than quoted prices in active markets for identical or similar assets and liabilities.
Level 3 - One or more inputs are unobservable and significant.

Financial and nonfinancial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

Cash equivalents are valued utilizing the market approach to measure fair value for financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The carrying amounts of our cash and cash equivalents, restricted cash, accounts receivable, accounts payable, and accrued liabilities approximate fair value as of September 30, 2023 and December 31, 2022 because of the relatively short duration of these instruments.

We did not have any transfers of assets or liabilities between Level 1, Level 2 and Level 3 of the fair value measurement hierarchy during the three and nine months ended September 30, 2023.
Assets measured at fair value on a recurring basis as of December 31, 2022 are summarized below. During the three months ended September 30, 2023, we sold all of our remaining Level 2 short-term investments included in the table below.

Fair Value Measurement as of December 31, 2022
Fair Value MeasurementBalance Sheet Classification
(in thousands)Fair Value LevelCost BasisUnrealized Gains (Losses)Fair ValueCash and Cash EquivalentsShort-term Investments
Money market fundsLevel 1$232,018 $— $232,018 $232,018 $— 
Certificates of depositLevel 2990 996 — 996 
Commercial paperLevel 21,281 1,287 — 1,287 
Short-term bond mutual fundsLevel 2100,242 (99)100,143 — 100,143 
Corporate bonds(a)
Level 278,418 (241)78,177 — 78,177 
Total$412,949 $(328)$412,621 $232,018 $180,603 

(a) Includes $745 and $743 of cost basis and fair market value, respectively, with a weighted average maturity of 1.3 years.