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Business Acquisition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 14, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Common stock, par value |  | $ 0.001 | $ 0.001
Business acquisition costs |  | $ 2,200 |
Goodwill |  | 44,466 |
General and Administrative [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition costs |  | $ 2,200 |
Anelixis [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, date of acquisition | Sep. 14, 2020 |  |
Common stock, par value | $ 0.001 |  |
Estimated fair value related to clinical development program | $ 32,386 |  |
Goodwill | 44,466 |  |
Anelixis [Member] | In-Process Research and Development [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Estimated fair value related to clinical development program | $ 32,400 |  |
Anelixis [Member] | Series X1 Preferred Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares Issued to stockholders of acquiree | 140,026 |  |
Anelixis [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Preferred stock shares agreed to sell | 199,112 |  |
Preferred stock shares aggregate purchase price | $ 99,100 |  |
Business combination additional commitments in equity financing | $ 9,000 |  |
Anelixis [Member] | Common Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares Issued to stockholders of acquiree | 175,488 |  |
Shares of common stock issued upon conversion of each share of preferred stock | 55.5556 |  |
Anelixis [Member] | Common Stock [Member] | Series X1 Preferred Stock [Member] | Stock Purchase Agreement [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares of common stock issued upon conversion of each share of preferred stock | 55.5556 |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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