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Assets and Liabilities Measured at Fair Value
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value Assets and Liabilities Measured at Fair Value
The Company's financial assets and liabilities are measured at fair value and classified within the fair value hierarchy, which is defined as follows:
Level 1 — Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
Level 2 — Inputs other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly.
Level 3 — Inputs that are unobservable for the asset or liability.
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 September 30, 2023 are identified in the following tables:
(in thousands) Level 2Total
Assets:  
Commercial paper$16,829 $16,829 
Money market6,818 6,818 
 $23,647 $23,647 
(in thousands) Level 2Total
Liabilities:  
Deferred compensation plan liability$6,718 $6,718 
 $6,718 $6,718 
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, 2022 are identified in the following tables:
(in thousands)Level 2Total
Assets:
Commercial paper$144,381 $144,381 
Money market5,808 5,808 
 $150,189 $150,189 
(in thousands)Level 2Level 3Total
Liabilities:   
Contingent consideration payable$— $21,417 $21,417 
Deferred compensation plan liability5,458 — 5,458 
 $5,458 $21,417 $26,875 
The Company's Senior Secured Term Loan due 2026 falls into the Level 2 category within the fair value level hierarchy and the fair value was determined using quoted prices for similar liabilities in active markets, as well as inputs that are observable for the liability (other than quoted prices), such as interest rates that are observable at commonly quoted intervals. The carrying value of the Senior Secured Term Loan due 2026 approximates the fair value. Deferred compensation plan liability is recorded as a component of other non-current liabilities on the Company's Consolidated Balance Sheets.
The Company did not have any Level 3 assets as of September 30, 2023 or December 31, 2022. Liabilities measured at fair value using Level 3 inputs consisted of contingent consideration.
Cash, Money Market Funds, and Marketable Securities
The Company classifies its cash within the fair value hierarchy as Level 1 as these assets are valued using quoted prices in an active market for identical assets at the measurement date. The Company considers its investments in marketable securities as available-for-sale and classifies these assets and the money market funds within the fair value hierarchy as Level 2 primarily utilizing broker quotes in a non-active market for valuation of these securities.
Contingent Consideration Payable
The contingent consideration payable resulted from the acquisition of Callidus Biopharma, Inc. ("Callidus") in November 2013. The Company reached regulatory milestones of $9.0 million in March 2023 and $15.0 million in September 2023 associated with the approval of Pombilitiby the EC and FDA, respectively. The $9.0 million milestone payment was paid in the second quarter of 2023 and the $15.0 million milestone payment, which is payable in cash, is recorded as a component of accounts payable on the Company's Consolidated Balance Sheets as of September 30, 2023.
The following table shows the change in the balance of contingent consideration payable for the three and nine months ended September 30, 2023 and 2022, respectively:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2023202220232022
Balance, beginning of the period$13,005 $19,266 $21,417 $20,339 
Changes in fair value during the period, included in the Consolidated Statements of Operations1,995 567 2,583 (506)
Milestone paid or payable in cash(15,000)— (24,000)— 
Balance, end of the period$— $19,833 $— $19,833