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Fair Value Measurements and Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements and Fair Value of Financial Instruments FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS
The following tables set forth the fair value of the Company’s financial assets that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands).
March 31, 2021
Level 1Level 2Level 3Total
Assets:Classification:
Money market funds
Cash and cash equivalents$444,668 $— $— $444,668 
U.S. Treasury securitiesInvestments— 85,379 — 85,379 
Total assets measured at fair value
$444,668 $85,379 $— $530,047 
December 31, 2020
Level 1Level 2Level 3Total
Assets:Classification:
Money market funds
Cash and cash equivalents$333,585 $— $— $333,585 
U.S. Treasury securitiesInvestments— 98,278 — 98,278 
Total assets measured at fair value
$333,585 $98,278 $— $431,863 
There were no financial liabilities measured at fair value. The Company classifies money market funds within Level 1 of the fair value hierarchy because they are valued using bank balances or quoted market prices. The Company classifies its investments in U.S. Treasury securities (Treasury bills, Treasury notes, and Treasury bonds) as Level 2 instruments and obtains fair value from an independent pricing service, which may use quoted market prices for identical or comparable instruments or model-driven valuations using observable market data or inputs corroborated by observable market data.
The carrying amount of the Company’s other receivables, prepaid expenses, other current assets, accounts payable, and accrued expenses approximate fair value due to their short maturities.
The following is a summary of the Company’s cash equivalents and investments and the gross unrealized holding gains and losses (in thousands):
March 31, 2021
Amortized Cost BasisUnrealized GainsUnrealized LossesFair Value
Assets:
Money market funds
$444,668 $— $— $444,668 
U.S. Treasury securities85,351 28 — 85,379 
Total$530,019 $28 $— $530,047 
December 31, 2020
Amortized Cost BasisUnrealized GainsUnrealized LossesFair Value
Assets:
Money market funds
$333,585 $— $— $333,585 
U.S. Treasury securities98,223 57 (2)98,278 
Total$431,808 $57 $(2)$431,863 
As of December 31, 2020, unrealized losses on available-for-sale investments are not attributable to credit risk and are considered to be temporary. The Company believes it is more likely than not that investments in an unrealized loss position will be held until maturity or the recovery of the cost basis of the investment. There were no
unrealized losses on available-for-sale investments as of March 31, 2021. To date, the Company has not recorded any impairment charges on marketable securities related to other-than-temporary declines in market value. As of March 31, 2021 and December 31, 2020, the weighted-average remaining maturity of the Company’s investment portfolio was less than one year.