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Acquisitions - Censa Acquisition (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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May 29, 2020 | Dec. 31, 2020
Acquisitions |  |
Issuance of common stock related to acquisition |  | $ 42,869
Censa [Member] |  |
Acquisitions |  |
Payments for asset acquisitions | $ 15,000 |
Payments for asset acquisitions, upfront payment | 10,400 |
Payments for asset acquisitions, net assets | $ 4,600 |
Issuance of common stock related to acquisition (in shares) | 845,364 |
Issuance of common stock related to acquisition | $ 42,900 |
Acquisition costs | 700 |
Total consideration | 58,600 |
Fair value of net assets acquired | 4,600 |
Asset acquisition, cash and cash equivalents | 3,800 |
Asset acquisition, other current assets | 800 |
Asset acquisition, in-process research and development | $ 54,000 |
Censa [Member] | Research and development |  |
Acquisitions |  |
Asset acquisition, research and development expense |  | 53,300
Censa [Member] | Selling, general and administrative |  |
Acquisitions |  |
Acquisition costs |  | $ 700

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6578-128477 + Details
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