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Financial Instruments | 12 Months Ended
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Dec. 31, 2021
Financial Instruments |
Financial Instruments | 4. Financial Instruments ​ The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value, and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value. Below is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2021
​ | ​ | Quoted Prices | ​ | Significant | ​ | Significant | ​ | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 1,853 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,853
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 39,000 | ​ | ​ | — | ​ | ​ | 39,000
Total | ​ | $ | 1,853 | ​ | $ | 39,000 | ​ | $ | — | ​ | $ | 40,853
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2020
​ | ​ | Quoted Prices | ​ | Significant | ​ | Significant | ​ | ​ | ​
​ | ​ | in Active | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 22,999 | ​ | $ | — | ​ | $ | — | ​ | $ | 22,999
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 20,000 | ​ | ​ | — | ​ | ​ | 20,000
Total assets | ​ | $ | 22,999 | ​ | $ | 20,000 | ​ | $ | — | ​ | $ | 42,999
​ At December 31, 2021 and 2020, cash equivalents approximated their fair value due to their short-term nature. In connection with the Quellis Acquisition, the Company issued a warrant to purchase 2,805 shares of Series X Preferred Stock at an exercise price of $341.70 per share. Upon stockholder approval of the Conversion Proposal, and reflecting the reverse stock split, the warrant became a warrant to purchase 467,500 shares of common stock at a purchase price of $2.10. This was originally accounted for as a liability until stockholder approval of the Conversion Proposal on June 2, 2021, at which point the warrant was reclassified to permanent equity. The warrant liability was valued based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The Company estimated the fair value of the warrant liability using Black-Scholes option-pricing models and assumptions that are based on the individual characteristics of the warrants on the valuation date, as well as assumptions including the fair value per share of the underlying security, the remaining contractual term of the warrant, risk-free interest rate, expected dividend yield and expected volatility of the price of the underlying security (in thousands). ​
​ | ​ | ​ | ​
​ |  | December 31, 2021
Balance at beginning of year | ​ | $ | —
Issuance of warrants | ​ |  | 4,332
(Decrease) increase in the fair value of the warrants | ​ |  | (864)
Reclassification of warrant liability to additional paid in-capital | ​ |  | (3,468)
Ending balance | ​ | $ | —
​ The fair value of the warrants was based on the following assumptions: ​
​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ |  | 2021 | ​
​ | ​ | ​ | ​
Weighted-average expected volatility |  | 89.1-89.3 | %
Expected term (in years) |  | 9.54-9.88 | ​
Risk-free interest rate |  | 1.064-1.725 | %
Expected dividend yield |  | 0 | %
​

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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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