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Assets and Liabilities Measured at Fair Value (Tables)
6 Months Ended
Jun. 30, 2021
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, 2021 are identified in the following tables:
(in thousands) Level 2Total
Assets:  
Commercial paper$147,339 $147,339 
Asset-backed securities20,680 20,680 
Corporate debt securities12,039 12,039 
U.S. government agency bonds26,071 26,071 
Money market funds4,582 4,582 
 $210,711 $210,711 
(in thousands) Level 2Level 3Total
Liabilities:   
Contingent consideration payable$— $27,317 $27,317 
Deferred compensation plan liability4,233 — 4,233 
 $4,233 $27,317 $31,550 
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, 2020 are identified in the following tables:
(in thousands)Level 2Total
Assets:
Commercial paper$217,095 $217,095 
Asset-backed securities9,438 9,438 
Corporate debt securities39,513 39,513 
U.S. government agency bonds53,582 53,582 
Money market funds4,427 4,427 
 $324,055 $324,055 
(in thousands)Level 2Level 3Total
Liabilities:   
Contingent consideration payable$— $25,825 $25,825 
Deferred compensation plan liability4,078 — 4,078 
 $4,078 $25,825 $29,903 
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 primarily for the ATB-200 Pompe program:
Contingent Consideration
Liability
Fair Value as of June 30, 2021Valuation TechniqueUnobservable InputRange
(in thousands)
     
  Discount rate7.5%
  
Clinical and regulatory milestones$25,914 Probability weighted discounted cash flowProbability of achievement of milestones
75% - 78%
  
  Projected year of payments
2021 - 2022
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, 2021 and 2020, respectively:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2021202020212020
Balance, beginning of the period$26,296 $23,612 $25,825 $22,681 
Changes in fair value during the period, included in the Consolidated Statements of Operations1,021 715 1,492 1,646 
Balance, end of the period (1)
$27,317 $24,327 $27,317 $24,327 
______________________________
(1) As of June 30, 2021, based on certain milestones that are expected to be reached within the next twelve months, $19.8 million was recorded as a current liability in the Consolidated Balance Sheets