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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Financial Instruments |
Schedule of assets and liabilities measured fair value on recurring basis | Below is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of June 30, 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 | ​ | $ | 1,841 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,841
Reverse repurchase agreements | ​ | ​ | — | ​ | ​ | 39,000 | ​ | ​ | — | ​ | ​ | 39,000
Total assets | ​ | $ | 1,841 | ​ | $ | 39,000 | ​ | $ | — | ​ | $ | 40,841
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | 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). ​
​ | ​ | ​ | ​
​ |  | June 30, 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 | ​ | $ | —

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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=117815213&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=117815213&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=117815213&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=117815213&loc=d3e19207-110258 + Details
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