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FAIR VALUE OF FINANCIAL INSTRUMENTS | 12 Months Ended
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Dec. 31, 2022
FAIR VALUE OF FINANCIAL INSTRUMENTS. |
FAIR VALUE OF FINANCIAL INSTRUMENTS | (3) FAIR VALUE OF FINANCIAL INSTRUMENTS The following tables summarize the Company’s financial assets measured at fair value on a recurring basis and their respective input levels based on the fair value hierarchy (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements Using
​ | ​ | ​ | ​ | ​ | Quoted Prices in | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Active Markets | ​ | Significant Other | ​ | Significant
​ | ​ | ​ | ​ | ​ | for Identical | ​ | Observable | ​ | Unobservable
​ | ​ | December 31, | ​ | Assets | ​ | Inputs | ​ | Inputs
​ |  | 2022 |  | (Level 1) |  | (Level 2) |  | (level 3)
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Cash equivalents |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market funds | ​ | $ | 18,436 | ​ | $ | 18,436 | ​ | $ | — | ​ | $ | —
Total cash equivalents | ​ |  | 18,436 | ​ |  | 18,436 | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Commercial paper | ​ |  | 55,577 | ​ |  | — | ​ |  | 55,577 | ​ |  | —
U.S. Treasury bills | ​ |  | 26,841 | ​ |  | 26,841 | ​ |  | — | ​ |  | —
Agency bonds | ​ |  | 24,405 | ​ |  | — | ​ |  | 24,405 | ​ |  | —
Total short-term investments | ​ |  | 106,823 | ​ |  | 26,841 | ​ |  | 79,982 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total fair value of assets | ​ | $ | 125,259 | ​ | $ | 45,277 | ​ | $ | 79,982 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements Using
​ |  | ​ | ​ |  | Quoted Prices in | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Active Markets |  | Significant Other | ​ | Significant
​ |  | ​ | ​ |  | for Identical |  | Observable | ​ | Unobservable
​ |  | December 31, |  | Assets |  | Inputs | ​ | Inputs
​ |  | 2021 |  | (Level 1) |  | (Level 2) |  | (level 3)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 39,653 | ​ | $ | 39,653 | ​ | $ | — | ​ | $ | —
Commercial paper | ​ |  | 14,448 | ​ |  | — | ​ |  | 14,448 | ​ |  | —
Total cash equivalents | ​ |  | 54,101 | ​ |  | 39,653 | ​ |  | 14,448 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. Treasury bills | ​ |  | 25,135 | ​ |  | 25,135 | ​ |  | — | ​ |  | —
Corporate debt securities | ​ |  | 10,715 | ​ |  | — | ​ |  | 10,715 | ​ |  | —
Commercial paper | ​ |  | 77,328 | ​ |  | — | ​ |  | 77,328 | ​ |  | —
Total short-term investments | ​ |  | 113,178 | ​ |  | 25,135 | ​ |  | 88,043 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total fair value of assets | ​ | $ | 167,279 | ​ | $ | 64,788 | ​ | $ | 102,491 | ​ | $ | —
​ Cash Equivalents and Short-Term Investments Financial assets measured at fair value on a recurring basis consist of the Company’s cash equivalents and short-term investments. Cash equivalents consisted of cash, money market funds and commercial paper, and short-term investments consisted of U.S. Treasury bills, agency bonds, corporate debt securities and commercial paper. The Company obtains pricing information from its investment manager and generally determines the fair value of investment securities using standard observable inputs, including reported trades, broker/dealer quotes, and bids and/or offers. The following tables summarize the Company’s short-term investments (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As of December 31, 2022 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Estimated fair |
​ |  | Maturity |  | cost |  | gains |  | losses |  | value |
Commercial paper |  | 1 year or less |  | ​ | 55,645 | ​ | ​ | 16 | ​ | ​ | (84) |  | ​ | 55,577 | ​
U.S. Treasury bills |  | 2 years or less |  | ​ | 27,108 |  | ​ | — |  | ​ | (267) |  | ​ | 26,841 | ​
Agency bond |  | 2 years or less |  | ​ | 24,536 |  | ​ | 2 |  | ​ | (133) |  | ​ | 24,405 | ​
​ | ​ | ​ | ​ | $ | 107,289 | ​ | $ | 18 | ​ | $ | (484) | ​ | $ | 106,823 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As of December 31, 2021 | ​
​ |  | ​ |  | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ |  | ​ |  | Amortized |  | unrealized | ​ | unrealized | ​ | Estimated fair | ​
​ |  | Maturity |  | cost |  | gains |  | losses |  | value | ​
Corporate debt securities |  | 1 year or less | ​ | $ | 10,726 | ​ | $ | — | ​ | $ | (11) | ​ | $ | 10,715 | ​
Commercial paper |  | 1 year or less | ​ |  | 77,328 | ​ |  | 9 | ​ |  | (9) | ​ |  | 77,328 | ​
U.S. Treasury bills |  | 2 years or less | ​ |  | 25,183 | ​ |  | — | ​ |  | (48) | ​ |  | 25,135 | ​
​ | ​ | ​ | ​ | $ | 113,237 | ​ | $ | 9 | ​ | $ | (68) | ​ | $ | 113,178 | ​
​ The following tables summarize the Company’s short-term investments with unrealized losses for less than 12 months and 12 months or greater: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2022
​ | ​ | Less than 12 months | ​ | 12 months or Greater | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | Unrealized | ​ | Total | ​ | Total Unrealized
​ |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value | ​ | Losses
Commercial paper | $ | 34,928 |  | $ | (84) | ​ | $ | — | ​ | $ | — |  | $ | 34,928 | ​ | $ | (84)
U.S. Treasury bills |  | 1,971 |  | ​ | (6) |  | ​ | 24,833 |  | ​ | (261) |  | ​ | 26,804 | ​ | ​ | (267)
Agency bond |  | 22,964 |  | ​ | (133) |  | ​ | — |  | ​ | — |  | ​ | 22,964 | ​ | ​ | (133)
​ | $ | 59,863 | ​ | $ | (223) | ​ | $ | 24,833 | ​ | $ | (261) | ​ | $ | 84,696 | ​ | $ | (484)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2021
​ | ​ | Less than 12 months | ​ | 12 months or Greater | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | Unrealized | ​ | Total | ​ | Total Unrealized
​ |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value | ​ | Losses
Corporate debt securities | $ | 10,757 |  | $ | (11) | ​ | $ | — | ​ | $ | — |  | $ | 10,757 | ​ | $ | (11)
Commercial paper |  | 33,204 |  | ​ | (9) |  | ​ | — |  | ​ | — |  | ​ | 33,204 | ​ | ​ | (9)
U.S. Treasury bills |  | 25,194 |  | ​ | (48) |  | ​ | — |  | ​ | — |  | ​ | 25,194 | ​ | ​ | (48)
​ | $ | 69,155 | ​ | $ | (68) | ​ | $ | — | ​ | $ | — | ​ | $ | 69,155 | ​ | $ | (68)
​ The Company considers whether unrealized losses have resulted from a credit loss or other factors. The unrealized losses on the Company’s available-for-sale securities as of December 31, 2022 were caused by fluctuations in market value and interest rates as a result of the economic environment and not credit risk. The Company concluded that an allowance for credit losses was unnecessary as of December 31, 2022. It is neither management’s intention to sell nor is it more likely than not that the Company will be required to sell these investments prior to recovery of their cost basis or recovery of fair value. Unrealized gains and losses are included in accumulated other comprehensive loss. Accrued interest receivable is written off through net realized investment gains (losses) at the time the issuer of the bond defaults or is expected to default on payment. Accrued interest receivable related to short-term investments was $0.3 million and $0.1 million as of December 31, 2022 and December 31, 2021, respectively.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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