Fair Value Measurement
The Company's financial instruments consist primarily of cash and cash equivalents, investments, accounts receivable, accounts payable and accrued liabilities. The carrying value of accounts receivable, accounts payable and accrued liabilities approximate their fair values because of their short-term nature. Estimated fair values of available-for-sale debt securities are generally based on prices obtained from commercial pricing services.
In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from sources independent from the Company) and to minimize the use of unobservable inputs (the Company’s assumptions about how market participants would price assets and liabilities). As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows:
•Level 1 - Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.
•Level 2 - Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
•Level 3 - Unobservable inputs that reflect the reporting entity’s own assumptions.
The following table summarizes the financial assets (cash, cash equivalents, restricted cash and investments) measured at fair value on a recurring basis:
| | | | | | | | | | | | | | | | | | | | | | | | | | |
| | December 31, 2023 |
| (in thousands) | | Level 1 | | Level 2 | | Level 3 | | Total |
| Financial assets: | | | | | | | | |
| Cash, cash equivalents and restricted cash | | $ | 48,875 | | | $ | — | | | $ | — | | | $ | 48,875 | |
| U.S. agency security | | — | | | — | | | — | | | — | |
| Corporate bond | | — | | | 33,781 | | | — | | | 33,781 | |
| Commercial paper | | — | | | 39,304 | | | — | | | 39,304 | |
| Treasury bill | | — | | | 122,806 | | | — | | | 122,806 | |
| Treasury bond | | — | | | 105,924 | | | — | | | 105,924 | |
| | | | | | | | |
| Total financial assets | | $ | 48,875 | | | $ | 301,815 | | | $ | — | | | $ | 350,690 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | |
| | December 31, 2022 |
| (in thousands) | | Level 1 | | Level 2 | | Level 3 | | Total |
| Financial assets: | | | | | | | | |
| Cash, cash equivalents and restricted cash | | $ | 94,172 | | | $ | — | | | $ | — | | | $ | 94,172 | |
| U.S. agency security | | — | | | 4,948 | | | — | | | 4,948 | |
| Corporate bond | | — | | | 104,080 | | | — | | | 104,080 | |
| Commercial paper | | — | | | 125,187 | | | — | | | 125,187 | |
| Treasury bill | | — | | | 12,282 | | | — | | | 12,282 | |
| Treasury bond | | — | | | 42,220 | | | — | | | 42,220 | |
| Yankee bond | | — | | | 6,501 | | | — | | | 6,501 | |
| Total financial assets | | $ | 94,172 | | | $ | 295,218 | | | $ | — | | | $ | 389,390 | |
The Company's Level 1 instruments include cash, cash equivalents and restricted cash that are valued using quoted market prices. Aurinia estimates the fair values of our investments in corporate debt securities, government and government related securities and certificates of deposits by taking into consideration valuations obtained from third-party pricing services. The fair value of the Company's investments classified within Level 2 is based upon observable inputs that may include benchmark yield curves, reported trades, issuer spreads, benchmark securities and reference data including market research publications. Additionally, at December 31, 2023 and December 31, 2022, the weighted average remaining contractual maturities of Aurinia's Level 2 investments were approximately 7 months for both periods. It is the Company's intent for these investments to have an overall rating of A-1, or higher, by Standard & Poor’s, or an equivalent rating by Moody’s or Fitch.
No credit loss allowance was recorded as of December 31, 2023 and December 31, 2022, as we do not believe the unrealized loss is a result of a credit loss due to the nature of our investments. We also considered the current and expected future economic and market conditions and determined that the estimate of credit losses was not significantly impacted.
Refer to Note 4, “Cash, Cash Equivalents and Restricted Cash and Investments,” for the carrying amount and related unrealized gains (losses) by type of investment.