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Regeneron License and Collaboration Arrangement (Tables) | 6 Months Ended
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Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Change in Company's Contract Liabilities | The following tables present changes in the Company’s contract liabilities for the six months ended June 30, 2021 and 2020 (in thousands):
Six Months Ended June 30, 2021 |  | Balance at beginning of period |  |  | Additions |  |  | Additions (Deductions) (1) |  |  | Balance at end of period |
Contract liability |  | $ | 13,980 |  |  | $ | — |  |  | $ | (833 | ) |  | $ | 13,147 |
Six Months Ended June 30, 2020 |  | Balance at beginning of period |  |  | Additions |  |  | Additions (Deductions) (1) |  |  | Balance at end of period |
Contract asset |  | $ | — |  |  | $ | 10,000 |  |  | $ | — |  |  | $ | 10,000 |
Contract liability |  | $ | 21,883 |  |  | $ | 10,000 |  |  | $ | (9,465 | ) |  | $ | 22,418 |
(1) Deductions to contract liabilities relate to deferred revenue recognized as revenue during the reporting period.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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