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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Instruments |
Schedule of assets and liabilities measured fair value on recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
Summary of warrant liability was valued based on significant inputs not observable in the market, which represents a Level 3 | ​
​ | ​ | ​ | ​
​ |  | 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 | ​ | $ | —
Schedule of fair value of the warrants | ​
​ | ​ | ​ | ​
​ | ​ | 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 Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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