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Fair Value Measurements and Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements and Fair Value of Financial Instruments Fair Value Measurements and Fair Value of Financial Instruments
The authoritative guidance on the fair value hierarchy for disclosure of fair value measurements is as follows:
Level 1: Quoted prices in active markets for identical assets or liabilities.
Level 2: Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
The fair value of Level 1 securities is determined using quoted prices in active markets for identical assets. Level 1 securities consist of highly liquid money market funds. Financial assets and liabilities are considered Level 2 when their fair values are determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves, and benchmark securities. In addition, Level 2 financial instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis. U.S. government and agency securities, commercial paper, corporate bond and certificates of deposit are valued primarily using market prices of comparable securities, bid/ask quotes, interest rate yields and prepayment spreads and are included in Level 2. In certain cases, where there is limited activity or less transparency around inputs to valuation, securities are classified as Level 3 within the valuation hierarchy.
The following is a summary of the Company’s cash equivalents and short-term investments:
March 31, 2020
Amortized
Cost Basis
Unrealized
Gains
Unrealized
Losses
Estimated
Fair Value
(In thousands)
Level 1:
Money market funds
$18,315  $—  $—  $18,315  
Level 2:
U.S. government and agency securities
86,930  78  (3) 87,005  
Commercial paper
171,736   (121) 171,624  
Corporate bonds
9,499   —  9,500  
Total cash equivalents and short-term investments286,480  88  (124) 286,444  
Less: cash equivalents
(119,540) 15  (15) (119,540) 
Total short-term investments$166,940  $103  $(139) $166,904  

December 31, 2019
Amortized
Cost Basis
Unrealized
Gains
Unrealized
Losses
Estimated
Fair Value
(In thousands)
Level 1:
Money market funds
$15,056  $—  $—  $15,056  
Level 2:
U.S. government and agency securities
37,974  14  (2) 37,986  
Commercial paper
87,983   (8) 87,983  
Corporate bonds
10,495   —  10,501  
Total cash equivalents and short-term investments151,508  28  (10) 151,526  
Less: cash equivalents
(51,391) —   (51,388) 
Total short-term investments$100,117  $28  $(7) $100,138  
As of March 31, 2020, $20.3 million of marketable securities had remaining maturities between one and two years. The remainder of the marketable securities have a remaining maturity of less than one year. As the Company may sell these securities at any time for use in current operations even if the securities have not yet reached maturity, all marketable securities are classified as current assets in the Company's consolidated balance sheet. Management regularly reviews all of the Company’s investments for other-than-temporary declines in estimated fair value. Management determined that the gross unrealized losses on the Company’s marketable securities as of March 31, 2020 were temporary in nature and none were in continuous loss position for 12 months or more. Therefore, none of the Company’s marketable securities were other-than-temporarily impaired as of March 31, 2020.