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Fair Value of Financial Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value of Financial Assets |
Schedule of financial assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value Measurements as of
​ | ​ | March 31, 2021 using:
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash Equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial Paper | ​ | $ | — | ​ | $ | 4,750 | ​ | $ | — | ​ | $ | 4,750
Money Market Funds | ​ | ​ | 81,365 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 81,365
Marketable Securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate Debt Securities and Commercial Paper | ​ | ​ | — | ​ | ​ | 317,479 | ​ | ​ | — | ​ | ​ | 317,479
Total | ​ | $ | 81,365 | ​ | $ | 322,229 | ​ | $ | — | ​ | $ | 403,594
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value Measurements as of
​ | ​ | December 31, 2020 using:
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash Equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate Debt Securities and Commercial Paper | ​ | $ | — | ​ | $ | 36,242 | ​ | $ | — | ​ | $ | 36,242
Money Market Funds | ​ |  | 63,182 | ​ |  | — | ​ |  | — | ​ |  | 63,182
Marketable Securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate Debt Securities and Commercial Paper | ​ | ​ | — | ​ | ​ | 71,938 | ​ | ​ | — | ​ | ​ | 71,938
Total | ​ | $ | 63,182 | ​ | $ | 108,180 | ​ | $ | — | ​ | $ | 171,362
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities and commercial paper (due within 1 year) | ​ | $ | 317,538 | ​ | $ | 1 | ​ | $ | (60) | ​ | $ | 317,479
​ | ​ | $ | 317,538 | ​ | $ | 1 | ​ | $ | (60) | ​ | $ | 317,479
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities and commercial paper (due within 1 year) | ​ | $ | 71,895 | ​ | $ | 43 | ​ | $ | — | ​ | $ | 71,938
​ | ​ | $ | 71,895 | ​ | $ | 43 | ​ | $ | — | ​ | $ | 71,938

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + 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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