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Fair Value Measurement
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
The Company is required to measure certain assets and liabilities at fair value, either upon initial recognition or for subsequent accounting or reporting. For example, the Company uses fair value extensively when accounting for and reporting certain financial instruments. Fair value is estimated by applying the hierarchy described below, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement.

ASC 820, Fair Value Measurement, defines fair value as a market-based measurement that should be determined based on the assumptions that marketplace participants would use in pricing an asset or liability. When estimating fair value, depending on the nature and complexity of the asset or liability, the Company may generally use one or each of the following techniques:  

Income approach, which is based on the present value of a future stream of net cash flows.

Market approach, which is based on market prices and other information from market transactions involving identical or comparable assets or liabilities.

As a basis for considering the assumptions used in these techniques, the standard establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows:  
Level 1 - Quoted prices for identical assets or liabilities in active markets.

Level 2 - Quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are directly or indirectly observable, or inputs that are derived principally from, or corroborated by, observable market data by correlation or other means.

Level 3 - Unobservable inputs that reflect estimates and assumptions.

The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying unaudited condensed consolidated balance sheets:

As of March 31, 2024
As of December 31, 2023
Fair Value Measurements:Level 1Level 2Level 3Level 1Level 2Level 3
Marketable securities (see Note 4)
Government securities - U.S.$52,995 $— $— $73,944 $— $— 
Total assets$52,995 $— $— $73,944 $— $— 

A review of fair value hierarchy classifications is conducted on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification for certain financial assets or liabilities. During the periods ended March 31, 2024 and December 31, 2023, respectively, there were no transfers in and out of Level 3. During the three months ended March 31, 2024 and 2023, respectively, the Company did not recognize any allowances for credit losses.

Some of the Company’s financial instruments, such as cash and cash equivalents, accounts receivable and accounts payable, are reflected in the balance sheet at carrying value, which approximates fair value due to their short-term nature.

Royalty Financing Obligation

As of March 31, 2024, the carrying value of the royalty financing obligation under the Royalty Purchase Agreement (“RPA”) approximated its fair value and was measured using the estimates of forecasted net product revenue based on current contractual and statutory requirements, specific known market events and trends, industry data, historical trends, current and expected patient demand and forecasted customer buying and payment patterns (Level 3 inputs). See Note 6: Royalty Financing Obligation for additional information regarding the Company’s royalty financing obligation.