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Marketable Securities | 12 Months Ended
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Dec. 31, 2022
Marketable Securities |
Marketable Securities | 3. Marketable Securities Marketable securities consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(in thousands) |  | Cost |  | Gain |  | Loss |  | Fair Value
Corporate bonds | ​ | $ | 133,163 | ​ | $ | — | ​ | $ | (1,457) | ​ | $ | 131,706
U.S. Government agencies | ​ | ​ | 1,612 | ​ | ​ | — | ​ | ​ | (37) | ​ | ​ | 1,575
Total | ​ | $ | 134,775 | ​ | $ | — | ​ | $ | (1,494) | ​ | $ | 133,281
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(in thousands) |  | Cost |  | Gain |  | Loss |  | Fair Value
Corporate bonds | ​ | $ | 207,917 | ​ | $ | 3 | ​ | $ | (666) | ​ | $ | 207,254
Total | ​ | $ | 207,917 | ​ | $ | 3 | ​ | $ | (666) | ​ | $ | 207,254
​ The Company uses the specific identification method when calculating realized gains and losses. For the years ended December 31, 2022 and 2021, respectively, the Company recorded $9 thousand and $57 thousand in realized gains on available-for-sale securities, which is included in other income on the statements of operations and comprehensive loss. The Company reviewed all investments which were in a loss position at the respective balance sheet dates, as well as the remainder of the portfolio. As of December 31, 2022, the Company had investments with a total fair market value of $133.3 million in an unrealized loss position, of which $91.8 million were in a continuous unrealized loss position for more than twelve months. The Company analyzed the unrealized losses and determined that market conditions were the primary factor driving these changes, and such unrealized losses are temporary as the Company anticipates a full recovery of the amortized cost basis of these securities at maturity. After analyzing the securities in an unrealized loss position, the portion of these losses that relate to changes in credit quality is insignificant. The Company does not intend to sell these securities, nor is it more likely than not that the Company will be required to sell them prior to the end of their contractual terms. Furthermore, the Company does not believe that these securities expose the Company to undue market risk or counterparty credit risk. The following table summarizes maturities of the Company’s investments available-for-sale as of December 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Fair
(in thousands) |  | Cost |  | Value
Maturities: | ​ | ​ | ​ | ​ | ​ | ​
Within 1 year | ​ | $ | 105,930 | ​ | $ | 104,660
Between 1 to 2 years | ​ |  | 28,845 | ​ |  | 28,621
Total investments available-for-sale | ​ | $ | 134,775 | ​ | $ | 133,281
​ The Company has classified all of its investments available-for-sale, including those with maturities beyond one year, as current assets on the accompanying balance sheets based on the highly liquid nature of these investment securities and because these investment securities are considered available for use in current operations. The Company has elected to report interest receivable from its marketable securities with prepaid expenses and other current assets on its balance sheet. Interest receivable included in prepaid expenses and other current assets totaled $0.7 million and $1.0 million as of December 31, 2022 and 2021, respectively.

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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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