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Fair Value Measurements
3 Months Ended
Mar. 31, 2022
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
MARCH 31, 2022
(in thousands)LEVEL 1LEVEL 2LEVEL 3TOTAL
Cash and cash equivalents:
Cash and cash equivalents$56,441 $— $— $56,441 
Total cash and cash equivalents:$56,441 $— $— $56,441 
Investments:
Certificates of deposit$— $9,030 $— $9,030 
Commercial paper— 54,270 — 54,270 
Corporate bonds— 45,554 — 45,554 
U.S. Government and government agencies— 33,938 — 33,938 
Total investments$— $142,792 $— $142,792 
Total cash, cash equivalents and investments:$56,441 $142,792 $— $199,233 
FAIR VALUE MEASUREMENTS AS OF
DECEMBER 31, 2021
(in thousands)LEVEL 1LEVEL 2LEVEL 3TOTAL
Cash and cash equivalents:
Cash and cash equivalents$37,187 $— $— $37,187 
Total cash and cash equivalents:$37,187 $— $— $37,187 
Investments:
Certificates of deposit$— $9,038 $— $9,038 
Commercial paper— 50,920 — 50,920 
Corporate bonds— 42,656 — 42,656 
Total investments$— $102,614 $— $102,614 
Total cash, cash equivalents and investments:$37,187 $102,614 $— $139,801 
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 $284.8 million and $270.4 million at March 31, 2022 and December 31, 2021, respectively.
There were no transfers between the different levels of the fair value hierarchy during the three months ended March 31, 2022 and 2021.