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Assets and Liabilities Measured at Fair Value (Tables)
12 Months Ended
Dec. 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 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 
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 tables:
(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 LiabilityFair Value as of December 31, 2020Valuation TechniqueUnobservable InputRange
(in thousands)
 Discount rate7.5%
Clinical and regulatory milestones$25,101 Probability weighted discounted cash flowProbability of achievement of milestones
75%-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 year ended December 31, 2020 and December 31, 2019, respectively:
Years ended December 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 Operations 3,144 3,297 
Adjustment for contingent consideration paid in stock— (316)
Balance, end of the period$25,825 $22,681