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Fair Value Measurement
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
Available-for-sale marketable securities consisted of the following (in thousands):
March 31, 2023
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Asset-backed securities$6,079 $$(10)$6,070 
Corporate debt securities10,206 (13)10,202 
U.S. treasury securities120,555 43 (98)120,500 
Agency bonds18,765 54 (1)18,818 
Commercial paper23,639 — (4)23,635 
$179,244 $107 $(126)$179,225 
December 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Asset-backed securities$1,146 $— $— $1,146 
Corporate debt securities7,139 — (9)7,130 
U.S. treasury securities111,469 — (934)110,535 
Agency bonds2,783 (1)2,784 
Commercial paper7,004 — — 7,004 
$129,541 $$(944)$128,599 
As of March 31, 2023, thirty-four available-for-sale marketable securities with a fair market value of $96.2 million were in a gross unrealized loss position of $0.1 million. Based on our review of these marketable securities, we believe none of the unrealized loss is as a result of a credit loss as of March 31, 2023, because we do not intend to sell these securities and it is not more-likely-than-not that we will be required to sell these securities before the recovery of their amortized cost basis.
The estimated fair value of our contractual maturities of available-for-sale debt securities were as follows (in thousands):
March 31, 2023December 31, 2022
Due within one year$154,591 $114,353 
Due after one year but within five years24,634 14,246 
$179,225 $128,599 
The following table summarizes, by major security type, our cash equivalents and available-for-sale marketable securities measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
March 31, 2023December 31, 2022
Level 1Level 2Total estimated fair valueLevel 1Level 2Total estimated fair value
Cash equivalents
Money market funds$70,345 $— $70,345 $191,704 $— $191,704 
Available-for-sale marketable
   securities
Asset-backed securities— 6,070 6,070 — 1,146 1,146 
Corporate debt securities— 10,202 10,202 — 7,130 7,130 
U.S. treasury securities120,500 — 120,500 110,535 — 110,535 
Agency bonds18,818 — 18,818 2,784 — 2,784 
Commercial paper— 23,635 23,635 — 7,004 7,004 
$209,663 $39,907 $249,570 $305,023 $15,280 $320,303 
We had no available for sale securities that were classified within Level 3 as of March 31, 2023 and December 31, 2022.
A contingent liability with a value of $15.7 million was assumed as part of the Antares acquisition related to TLANDO. The acquisition date fair value was measured using the income approach, specifically the probability weighted expected return method for the development milestone payments and the option pricing methodology using the Monte Carlo simulation for commercial milestone payments and royalty payments. The fair value of the contingent liability will be remeasured on a quarterly basis. Estimates and assumptions used in the Monte Carlo simulation include forecasted revenues, cost of debt, risk free rate, weighted average cost of capital, revenue market price risk and revenue volatility. Estimates and assumptions used in the income approach include the probability of achieving certain milestones and a discount rate. These unobservable inputs represent a Level 3 measurement because they are supported by little or no market activity and reflect our own assumptions in measuring fair value. Changes in the fair value subsequent to the acquisition date will be recognized in our condensed consolidated statements of income.