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Fair Value Measurements
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables summarize the fair value of financial assets and liabilities that are measured at fair value and the classification by level of input within the fair value hierarchy:
FAIR VALUE MEASUREMENTS AS OF
SEPTEMBER 30, 2020
(in thousands)LEVEL 1LEVEL 2LEVEL 3TOTAL
Cash and cash equivalents:
Cash and cash equivalents$129,787 $— $— $129,787 
Total cash and cash equivalents:$129,787 $— $— $129,787 
Investments:
Commercial paper$— $44,815 $— 44,815 
Corporate bonds— 43,830 — 43,830 
Total investments$— $88,645 $— $88,645 
Total cash, cash equivalents and investments:$129,787 $88,645 $— $218,432 

FAIR VALUE MEASUREMENTS AS OF
DECEMBER 31, 2019
(in thousands)LEVEL 1LEVEL 2LEVEL 3TOTAL
Cash and cash equivalents:
Cash and money market funds$133,931 $10,009 $— $143,940 
Total cash and cash equivalents:$133,931 $10,009 $— $143,940 
Investments:
Commercial paper$— $64,622 $— $64,622 
Corporate bonds— 60,564 — 60,564 
U.S. Government and government agencies— 40,064 — 40,064 
Total investments$— $165,250 $— $165,250 
Total cash, cash equivalents and investments:$133,931 $175,259 $— $309,190 
The fair value of the Convertible Notes, which differs from their carrying value, is influenced by interest rates, stock price and stock price volatility and is determined by prices observed in market trading. The market for trading of the Convertible Notes is not considered to be an active market and therefore the estimate of fair value is based on Level 2 inputs. The estimated fair value of the Convertible Notes was $251.5 million at September 30, 2020.