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Investments | 6 Months Ended
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Jun. 30, 2023
Schedule of Investments [Abstract] |
Investments | 3. Investments Cash Equivalents — Cash equivalents consist of highly liquid investments with original or remaining maturities of 90 days or less at the time of purchase that are readily convertible into cash. Available-for-Sale Investment — The Thirona convertible notes are classified as available-for-sale securities and are included in prepaid expenses and other current assets in the condensed consolidated balance sheets. Available-for-sale investments are subsequently measured at fair value with realized gains and losses reported in other income (expense) in the condensed consolidated statements of operations. Unrealized holding gains and losses are excluded from earnings and reported in other comprehensive income until realized. The Company determines fair value of its available-for-sale investments using level 3 inputs. The Company evaluates the fair value of its investment in Thirona by applying a Monte Carlo simulation model. For the three and six months ended June 30, 2023, the Company recognized $0.1 million and $0.2 million, respectively, of interest income on investment and $0.1 million and $0.2 million of interest income on investment, respectively, for the three and six months ended June 30, 2022. As of June 30, 2023 and December 31, 2022, the fair value of the Company's investment in Thirona was $8.4 million and $7.1 million, respectively. For the three and six months ended June 30, 2023, the Company recognized a gain of $0.9 million on its investment in Thirona as a result of the recovery of a temporary impairment, as well as an unrealized holding gain of $0.4 million. Held-to-Maturity Investments — Investments consist of highly liquid investments that are intended to facilitate liquidity and capital preservation. The amortization or accretion of the Company’s investments is recognized as interest income in the condensed consolidated statements of operations. For the three and six months ended June 30, 2023, the Company recognized $1.0 million and $2.2 million, respectively, of interest income on investments and $0.4 million, for each respective period, of amortization on certain investments. For the three and six months ended June 30, 2022, the Company recognized $0.5 million and $0.9 million, respectively, of interest income on investments, and $0.2 million and $0.5 million, respectively, of amortization on certain investments. No allowance for credit losses on held-to-maturity securities was required as of June 30, 2023. The contractual maturities of the Company’s held to maturity investments are summarized below (in thousands):
|  | June 30, 2023 |  |  | December 31, 2022 |
|  | Amortized Cost Basis |  |  | Aggregate Fair Value |  |  | Amortized Cost Basis |  |  | Aggregate Fair Value |
Due in one year or less(1) |  | $ | 133,088 |  |  | $ | 132,864 |  |  | $ | 152,862 |  |  | $ | 156,976 |
Due after one year through five years |  |  | 2,282 |  |  |  | 2,258 |  |  |  | 1,961 |  |  |  | 1,948 |
Total |  | $ | 135,370 |  |  | $ | 135,122 |  |  | $ | 154,823 |  |  | $ | 158,924 |
___________________________ (1) The investments due in one year or less include cash equivalents of $74.9 million as of June 30, 2023 and $51.8 million as of December 31, 2022. The fair value of the cash equivalents, long-term and short-term investments are disclosed below (dollars in thousands).
|  | June 30, 2023 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Gains (Losses) |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 46,369 |  |  | $ | (108 | ) |  | $ | 46,261 |
Money market funds |  | Level 1 |  |  | 73,479 |  |  |  | 6 |  |  |  | 73,485 |
U.S. Treasuries |  | Level 2 |  |  | 15,522 |  |  |  | (146 | ) |  |  | 15,376 |
Total cash equivalents and investments |  |  |  |  | 135,370 |  |  |  | (248 | ) |  |  | 135,122 |
Less: cash equivalents |  |  |  |  | 74,925 |  |  |  | — |  |  |  | 74,925 |
Total Investments |  |  |  | $ | 60,445 |  |  | $ | (248 | ) |  | $ | 60,197 |
|  | December 31, 2022 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Gains (Losses) |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 66,762 |  |  | $ | (594 | ) |  | $ | 66,168 |
Money market funds |  | Level 1 |  |  | 51,783 |  |  |  | — |  |  |  | 51,783 |
U.S. Treasuries |  | Level 2 |  |  | 36,278 |  |  |  | (587 | ) |  |  | 35,691 |
Total cash equivalents and investments |  |  |  |  | 154,823 |  |  |  | (1,181 | ) |  |  | 153,642 |
Less: cash equivalents |  |  |  |  | 51,783 |  |  |  | — |  |  |  | 51,783 |
Total Investments |  |  |  | $ | 103,040 |  |  | $ | (1,181 | ) |  | $ | 101,859 |
As of June 30, 2023, there was $0.2 million of amounts receivable included in our condensed consolidated balance sheets as prepaid expenses and other current assets, which consisted of a de minimis amount of accrued interest receivable and $0.2 million of amount receivable on matured investment. As of December 31, 2022, there was $0.6 million of accrued interest receivable and $5.1 million of amount receivable on matured investment.

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