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Assets and Liabilities Measured at Fair Value (Tables)
6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Summary of Assets and Liabilities Subject to Fair Value Measurements
A summary of the fair value of the Company's recurring assets and liabilities aggregated by the level in the fair value hierarchy within which those measurements fall as of June 30, 2022 are identified in the following tables:
(in thousands) Level 2Total
Assets:  
Commercial paper$102,846 $102,846 
U.S. government agency bonds44,964 44,964 
Asset-backed securities2,991 2,991 
Money market5,362 5,362 
 $156,163 $156,163 
(in thousands) Level 2Level 3Total
Liabilities:   
Contingent consideration payable$— $19,266 $19,266 
Deferred compensation plan liability4,977 — 4,977 
 $4,977 $19,266 $24,243 
A summary of the fair value of the Company's recurring assets and liabilities aggregated by the level in the fair value hierarchy within which those measurements fall as of December 31, 2021 are identified in the following tables:
(in thousands)Level 2Total
Assets:
Commercial paper$174,531 $174,531 
Corporate debt securities32,311 32,311 
Asset-backed securities30,056 30,056 
Money market5,150 5,150 
 $242,048 $242,048 
(in thousands)Level 2Level 3Total
Liabilities:   
Contingent consideration payable$— $20,339 $20,339 
Deferred compensation plan liability4,800 — 4,800 
 $4,800 $20,339 $25,139 
Schedule of Significant Unobservable Inputs Used in the Valuation of the Contingent Consideration Payable
The following significant unobservable inputs were used in the valuation of the contingent consideration payable of Callidus for the ATB200 Pompe disease program:
Contingent Consideration
Liability
Fair Value as of June 30, 2022Valuation TechniqueUnobservable InputRange
(in thousands)
     
  Discount rate7.5%
  
Clinical and regulatory milestones$19,266 Probability weighted discounted cash flowProbability of achievement of milestones
75% - 88%
  
  Projected year of payments
2022 - 2023
Schedule of Changes in Continent Consideration Payable
The following table shows the change in the balance of contingent consideration payable for the three and six months ended June 30, 2022 and 2021, respectively:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2022202120222021
Balance, beginning of the period$19,151 $26,296 $20,339 $25,825 
Changes in fair value during the period, included in the Consolidated Statements of Operations115 1,021 (1,073)1,492 
Balance, end of the period (1)
$19,266 $27,317 $19,266 $27,317 
______________________________
(1) As certain milestones are expected to be reached within the next twelve months, the June 30, 2022 balance was recorded as a current liability in the Consolidated Balance Sheets.