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Assets and Liabilities Measured at Fair Value (Tables)
3 Months Ended
Mar. 31, 2020
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 March 31, 2020 are identified in the following table:
(in thousands) Level 2Total
Assets:  
Commercial paper$35,348  $35,348  
Asset-backed securities68,795  68,795  
Corporate debt securities107,098  107,098  
U.S. government agency bonds4,000  4,000  
Money market funds3,378  3,378  
 $218,619  $218,619  

(in thousands) Level 2Level 3Total
Liabilities:   
Contingent consideration payable$—  $23,612  $23,612  
Deferred compensation plan liability3,055  —  3,055  
 $3,055  $23,612  $26,667  
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, 2019 are identified in the following table:
 
(in thousands)Level 2Total
Assets:
Commercial paper$73,710  $73,710  
Asset-backed securities77,810  77,810  
Corporate debt securities145,991  145,991  
U.S. government agency bonds11,991  11,991  
Money market funds4,768  4,768  
 $314,270  $314,270  

(in thousands)Level 2Level 3Total
Liabilities:   
Contingent consideration payable$—  $22,681  $22,681  
Deferred compensation plan liability4,419  —  4,419  
 $4,419  $22,681  $27,100  
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 ATB-200 Pompe program:
Contingent Consideration
Liability
Fair Value as of March 31, 2020Valuation TechniqueUnobservable InputRange
(in thousands)
     
  Discount rate9.4%
  
Clinical and regulatory milestones$22,985  Probability weighted discounted cash flowProbability of achievement of milestones75% - 78%
  
  Projected year of payments2021 - 2022
Schedule of changes in contingent consideration payable
The following table shows the change in the balance of contingent consideration payable for the three months ended March 31, 2020 and March 31, 2019, respectively:
Three Months Ended March 31,
(in thousands)20202019
Balance, beginning of the period$22,681  $19,700  
Changes in fair value during the period, included in the Consolidated Statements of Operations931  1,383  
Adjustment for contingent consideration paid in stock —  (316) 
Balance, end of the period$23,612  $20,767