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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair value, assets measured on recurring basis
Assets and liabilities measured at fair value on a recurring basis as of March 31, 2021 were as follows (in thousands):
March 31, 2021
Level 1Level 2Level 3Total
(unaudited)
Money market funds$125,378 $— $— $125,378 
U.S. Treasury notes49,130 — — 49,130 
Commercial paper— 57,067 — 57,067 
Corporate bonds— 27,610 — 27,610 
Contingent consideration liabilities— — (32,444)(32,444)
Total
$174,508 $84,677 $(32,444)$226,741 
Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 were as follows (in thousands):
December 31, 2020
Level 1Level 2Level 3Total
Money market funds$79,387 $— $— $79,387 
U.S. Treasury notes59,389 — — 59,389 
Commercial paper— 68,018 — 68,018 
Corporate bonds— 48,501 — 48,501 
Asset-backed securities— 3,009 — 3,009 
Contingent consideration liabilities— — (31,264)(31,264)
Total
$138,776 $119,528 $(31,264)$227,040 
Fair value, liabilities measured on recurring basis The recurring Level 3 fair value measurements of the contingent consideration liabilities include the other following significant inputs as of March 31, 2021:
Valuation MethodFair ValueMarket Price of Revenue RiskRevenue VolatilityStock Price Volatility
(unaudited)
Revenue-based earn-out liabilitiesMonte Carlo$32.4 million3%10%41%

The Able Health acquisition consideration included an initial estimate for contingent consideration for shares of our common stock if certain incremental billing targets for Able Health were met during an earn-out period that ended on December 31, 2020. This Able Health earn-out contingent consideration liability was settled during the three months ended March 31, 2021.
Liabilities measured on recurring basis, unobservable input reconciliation
The following table sets forth a summary of the changes in the estimated fair value of the contingent consideration liabilities, which are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(unaudited)
Balance as of December 31, 2020
$31,264 
Settlement of contingent consideration(1,009)
Change in fair value of contingent consideration liabilities2,156 
Balance as of March 31, 2021
$32,411