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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Financial instruments measured at fair value | The table below summarizes certain financial instruments measured at fair value that are included within the accompanying balance sheets, and their designation among the three fair value measurement categories (see Note 2(xiii)):
| June 30, 2021 Fair Value Measurements
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Money market funds | $ | 176,710 |  |  | $ | — |  |  | $ | — |  |  | $ | 176,710 |
Equity warrant rights | — |  |  | — |  |  | 1,076 |  |  | 1,076 |
Total assets measured at fair value | $ | 176,710 |  |  | $ | — |  |  | $ | 1,076 |  |  | $ | 177,786 |
| December 31, 2020 Fair Value Measurements
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Money market funds | $ | 168,129 |  |  | — |  | — |  | $ | 168,129 |
Total assets measured at fair value | $ | 168,129 |  |  | — |  | — |  | $ | 168,129 |
Changes in fair value of derivative liability | The following table sets forth a summary of the changes in fair value of the equity warrant rights presented in "other assets" on the accompanying Condensed Balance Sheets. The measurement of the equity warrant rights represents a Level 3 financial instrument:
| Equity Warrant Rights, presented in "other assets" within the Condensed Consolidated Balance Sheets
Fair value as of December 31, 2020 | $ | — |
Initial fair value estimate of equity warrant rights upon issuance | 1,233 |
Fair value as of March 31, 2021 | $ | 1,233 |
Revaluation of equity warrant rights upon achievement of first development milestone, included in "license fees" within the Condensed Statement of Operations for the three months ended June 30, 2021 | 719 |
Revaluation of equity warrant rights included in "other income (expense), net" within the Condensed Statement of Operations for the three months ended June 30, 2021 | (876) |
Fair value as of June 30, 2021 | $ | 1,076 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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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