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Investments | 12 Months Ended
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Dec. 31, 2022
Schedule Of Investments [Abstract] |
Investments | 4. 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. As of December 31, 2022 and 2021, the Company held $69.8 million and $124.2 million, respectively, of cash and cash equivalents. Available-for-Sale Investment — The Thirona convertible note is classified as an available-for-sale security and is included in other assets in the consolidated balance sheet. Available-for-sale investments are subsequently measured at fair value. 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. As of December 31, 2022, the Company evaluated the fair value of its investment in Thirona using a Monte Carlo simulation which resulted in a fair value of $7.1 million. In addition, the Company determined that there was a related credit loss of $0.9 million on the investment which was recognized in the consolidated statements of operations for the year ended December 31, 2022. Held-to-Maturity Investments — Investments consist of highly liquid investments that are intended to facilitate liquidity and capital preservation. As of December 31, 2022, the Company held $101.1 million of short-term investments and $2.0 million of long-term investments. As of December 31, 2021, the Company held $79.9 million of short-term investments and $56.6 million of long-term investments. The amortization or accretion of the Company’s investments is recognized as interest income in the consolidated statements of operations and was approximately $0.7 million and $0.5 million for the years ended December 31, 2022 and 2021, respectively. No allowance for credit losses on held-to-maturity securities was required as of December 31, 2022 or 2021. The contractual maturities of the Company’s held to maturity investments as of December 31, 2022 and 2021 are summarized below (in thousands):
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | Amortized Cost Basis |  |  | Aggregate Fair Value |  |  | Amortized Cost Basis |  |  | Aggregate Fair Value |
Due in one year or less(1) |  |  | 152,862 |  |  |  | 156,976 |  |  | $ | 103,733 |  |  | $ | 103,669 |
Due after one year through five years |  |  | 1,961 |  |  |  | 1,948 |  |  |  | 56,619 |  |  |  | 56,433 |
Total |  |  | 154,823 |  |  |  | 158,924 |  |  | $ | 160,352 |  |  | $ | 160,102 |
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(1) | The investments due in one year or less include cash equivalents of $51.8 million as of December 31, 2022 and $23.8 million as of December 31, 2021.
The fair value of the cash equivalents, long-term and short-term investments are disclosed below (in millions):
|  | December 31, 2022 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Losses |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 66.8 |  |  | $ | (0.6 | ) |  | $ | 66.2 |
Money market funds |  | Level 1 |  |  | 51.8 |  |  |  | — |  |  | $ | 51.8 |
U.S. Treasuries |  | Level 2 |  |  | 36.3 |  |  |  | (0.6 | ) |  | $ | 35.7 |
Total cash equivalents and investments |  |  |  | $ | 154.9 |  |  | $ | (1.2 | ) |  | $ | 153.7 |
Less cash equivalents |  |  |  |  | (51.8 | ) |  |  | — |  |  |  | (51.8 | )
Total Investments |  |  |  | $ | 103.1 |  |  | $ | (1.2 | ) |  | $ | 101.9 |
|  | December 31, 2021 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Losses |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 115.2 |  |  | $ | 0.2 |  |  | $ | 115.0 |
Money market funds |  | Level 1 |  |  | 21.3 |  |  |  | — |  |  |  | 21.3 |
U.S. Treasuries |  | Level 2 |  |  | 23.9 |  |  |  | 0.1 |  |  |  | 23.8 |
Total cash equivalents and investments |  |  |  | $ | 160.4 |  |  | $ | 0.3 |  |  | $ | 160.1 |
Less cash equivalents |  |  |  |  | (23.8 | ) |  |  | — |  |  |  | (23.8 | )
Total Investments |  |  |  | $ | 136.6 |  |  | $ | 0.3 |  |  | $ | 136.3 |
As of December 31, 2022, there was $0.6 million of accrued interest receivable and $5.1 million of amount receivable on matured investment recognized as prepaid expense and other current assets in our consolidated balance sheets. As of December 31, 2021, there was $0.3 million of accrued interest receivable recognized as other assets in our consolidated balance sheets.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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