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Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of assets at fair value on recurring basis The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 (in thousands):
Level 1Level 2Level 3Total
Assets
Cash and cash equivalents (1)
$5,877 $— $— $5,877 
Total fair value of assets measured on a recurring basis$5,877 $— $— $5,877 
Liabilities
Warrants (2)
$— $— $13,730 $13,730 
Total fair value of liabilities measured on a recurring basis$— $— $13,730 $13,730 
(1) Represents the cash and cash equivalents and restricted cash and restricted investments that were held in money market funds as of December 31, 2020.
(2) Represents the fair value of 1,513,786 shares issuable under the warrant agreements discussed in Note 10.
Summary of liabilities at fair value on recurring basis The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 (in thousands):
Level 1Level 2Level 3Total
Assets
Cash and cash equivalents (1)
$5,877 $— $— $5,877 
Total fair value of assets measured on a recurring basis$5,877 $— $— $5,877 
Liabilities
Warrants (2)
$— $— $13,730 $13,730 
Total fair value of liabilities measured on a recurring basis$— $— $13,730 $13,730 
(1) Represents the cash and cash equivalents and restricted cash and restricted investments that were held in money market funds as of December 31, 2020.
(2) Represents the fair value of 1,513,786 shares issuable under the warrant agreements discussed in Note 10.
Changes in contingent consideration measured at fair value
The changes in our liabilities measured at fair value for which the Company uses Level 3 inputs to determine fair value for the six months ended June 30, 2021 and 2020 are as follows (in thousands):
For the Six Months Ended June 30,
20212020
Balance as of beginning of period$13,730 $16,975 
Settlements(13,730)(3,500)
Realized and unrealized gains (losses), net— (4,975)
Balance as of end of period$— $8,500 
Valuation techniques and significant unobservable inputs of Level 3 fair value measurements
The following table summarizes the fair value (in thousands), valuation techniques and significant unobservable inputs of our Level 3 fair value measurements as of December 31, 2020:

Fair ValuationSignificantAssumption or
ValueTechniqueUnobservable InputsInput Ranges
Warrants$13,730 Black-ScholesStock price volatility62.2 %
Annual risk free rate0.2 %