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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value | The following table presents the hierarchy for our assets and liabilities measured at fair value (in thousands):
|  | June 30, 2023 |  | December 31, 2022
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments, excluding Viking(1) |  | $ | 9,239 |  |  | $ | 144,939 |  |  | $ | 278 |  |  | $ | 154,456 |  |  | $ | 3,992 |  |  | $ | 99,615 |  |  | $ | 135 |  |  | $ | 103,742 |
Investment in Viking common stock |  | 36,140 |  |  | — |  |  | — |  |  | 36,140 |  |  | 63,122 |  |  | — |  |  | — |  |  | 63,122 |
Total assets |  | $ | 45,379 |  |  | $ | 144,939 |  |  | $ | 278 |  |  | $ | 190,596 |  |  | $ | 67,114 |  |  | $ | 99,615 |  |  | $ | 135 |  |  | $ | 166,864 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CyDex contingent liabilities |  | $ | — |  |  | $ | — |  |  | $ | 85 |  |  | $ | 85 |  |  | $ | — |  |  | $ | — |  |  | $ | 84 |  |  | $ | 84 |
Metabasis contingent liabilities(2) |  | — |  |  | 3,487 |  |  | — |  |  | 3,487 |  |  | — |  |  | 3,429 |  |  | — |  |  | 3,429 |
Amounts owed to former licensor |  | — |  |  | — |  |  | — |  |  | — |  |  | 44 |  |  | — |  |  | — |  |  | 44 |
Total liabilities |  | $ | — |  |  | $ | 3,487 |  |  | $ | 85 |  |  | $ | 3,572 |  |  | $ | 44 |  |  | $ | 3,429 |  |  | $ | 84 |  |  | $ | 3,557 |
1.Excluding our investment in Viking, our short-term investments in marketable debt and equity securities are classified as available-for-sale securities based on management's intentions and are at level 2 of the fair value hierarchy, as these investment securities are valued based upon quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Short-term investments in bond funds are valued at their net asset value (NAV) on the last day of the period. We have classified marketable securities with original maturities of greater than one year as short-term investments based upon our ability and intent to use any and all of those marketable securities to satisfy the liquidity needs of our current operations. In addition, we have investment in warrants resulting from Seelos Therapeutics Inc. milestone payments that were settled in shares during the first quarter of 2019 and are at level 3 of the fair value hierarchy, based on Black-Scholes value estimated by management on the last day of the period. 2.In connection with our acquisition of Metabasis in January 2010, we issued Metabasis stockholders four tradable CVRs, one CVR from each of four respective series of CVR, for each Metabasis share. The CVRs entitle Metabasis stockholders to cash payments as frequently as every six months as cash is received by us from proceeds from the sale or partnering of any of the Metabasis drug development programs, among other triggering events. The liability for the CVRs is determined using quoted prices in a market that is not active for the underlying CVR. The carrying amount of the liability may fluctuate significantly based upon quoted market prices and actual amounts paid under the agreements may be materially different than the carrying amount of the liability. Several of the Metabasis drug development programs have been outlicensed to Viking, including VK2809. VK2809 is a novel selective TR-β agonist with potential in multiple indications, including hypercholesterolemia, dyslipidemia, NASH, and X-ALD. Under the terms of the agreement with Viking, we may be entitled to up to $375.0 million of development, regulatory and commercial milestones and tiered royalties on potential future sales including a $10.0 million payment upon initiation of a Phase 3 clinical trial. During the three and six months ended June 30, 2023, we adjusted the balance of the Metabasis CVR liability by increasing $0.7 million and $0.1 million to mark to market, respectively.
Schedule of Reconciliation of Level 3 Financial Instruments | A reconciliation of the level 3 financial instruments as of June 30, 2023 is as follows (in thousands):
Fair value of level 3 financial instruments as of December 31, 2022 | $ | 84 |
Payments to CVR holders and other contingent payments | (50) |
Fair value adjustments to contingent liabilities | 51 |
Fair value of level 3 financial instruments as of June 30, 2023 | $ | 85 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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