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Fair Value of Financial Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value of Financial Assets and Liabilities |
Schedule of summary of the assets and liabilities measured at fair value on a recurring basis | The following tables summarize the assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 2020
​ |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Money market funds, included in cash and cash equivalents | ​ | $ | 119,841 | ​ | $ | 119,841 | ​ | $ | — | ​ | $ | —
U.S. Treasury obligations, included in cash and cash equivalents | ​ | ​ | 9,998 | ​ | $ | 9,998 | ​ | $ | — | ​ | $ | —
Marketable securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. Treasury obligations | ​ | ​ | 180,673 | ​ | ​ | 180,673 | ​ | ​ | — | ​ | ​ | —
Total assets | ​ | $ | 310,512 | ​ | $ | 310,512 | ​ | $ | — | ​ | $ | —
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 2019
​ |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Money market funds, included in cash and cash equivalents | ​ | $ | 34,896 | ​ | $ | 34,896 | ​ | $ | — | ​ | $ | —
Marketable securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. Treasury obligations | ​ |  | 121,140 | ​ |  | 121,140 | ​ |  | — | ​ |  | —
Total assets | ​ | $ | 156,036 | ​ | $ | 156,036 | ​ | $ | — | ​ | $ | —

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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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