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Fair Value Measurement
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
The Company is required to measure certain assets and liabilities at fair value, either upon initial recognition or for subsequent accounting or reporting. For example, we use fair value extensively when accounting for and reporting certain financial instruments, when measuring certain contingent consideration liabilities and in the initial recognition of net assets acquired in a business combination. Fair value is estimated by applying the hierarchy described below, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement.  

ASC 820, “Fair Value Measurements and Disclosures,” defines fair value as a market-based measurement that should be determined based on the assumptions that marketplace participants would use in pricing an asset or liability. When estimating fair value, depending on the nature and complexity of the asset or liability, we may generally use one or each of the following techniques:  

Income approach, which is based on the present value of a future stream of net cash flows.
Market approach, which is based on market prices and other information from market transactions involving identical or comparable assets or liabilities.
As a basis for considering the assumptions used in these techniques, the standard establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows:  
Level 1 - Quoted prices for identical assets or liabilities in active markets.
Level 2 - Quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are directly or indirectly observable, or inputs that are derived principally from, or corroborated by, observable market data by correlation or other means.
Level 3 - Unobservable inputs that reflect estimates and assumptions.
The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying unaudited condensed consolidated balance sheets:
As of March 31, 2021As of December 31, 2020
Fair Value Measurements:Level 1Level 2Level 3Level 1Level 2Level 3
Marketable securities (see Note 6)
Mutual and money market funds$101,696 $— $— $104,672 $— $— 
Corporate bonds— 23,591 — — 22,155 — 
Government securities - U.S.— 17,353 — — 18,999 — 
Other fixed-income securities— 3,163 — — 3,854 — 
Total assets$101,696 $44,107 $— $104,672 $45,008 $— 
A review of fair value hierarchy classifications is conducted on a quarterly basis.  Changes in the observability of valuation inputs may result in a reclassification for certain financial assets or liabilities. During the periods ended March 31, 2021 and December 31, 2020, respectively, there were no transfers in and out of Level 1, 2, or 3. During the three months ended March 31, 2021 and 2020, respectively, we did not recognize any other-than-temporary impairment loss.
Some of the Company’s financial instruments, such as cash and cash equivalents, accounts receivable and accounts payable, are reflected in the balance sheet at carrying value, which approximates fair value due to their short-term nature.

Debt

We estimate the fair value of our $143,750 aggregate principal amount of the 2023 Notes based on interest rates that would be currently available to the Company for issuance of similar types of debt instruments with similar terms and remaining maturities or recent trading prices obtained from brokers (a Level 2 input). The estimated fair value of the 2023 Notes at March 31, 2021 is $161,090.

See Note 9: Long-Term Debt for additional information regarding our debt obligations.