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Stock-Based Awards (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of stock-based compensation expense was classified in the statements of operations and comprehensive loss | Stock-based compensation expense was classified in the condensed consolidated statements of operations and comprehensive loss as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, | ​
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Research and development expenses | ​ | $ | 2,376 | ​ | $ | 936 | ​ | $ | 4,274 | ​ | $ | 1,763 | ​
General and administrative expenses | ​ |  | 2,001 | ​ |  | 432 | ​ |  | 3,582 | ​ |  | 1,109 | ​
Total | ​ | $ | 4,377 | ​ | $ | 1,368 | ​ | $ | 7,856 | ​ | $ | 2,872 | ​

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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