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Acquisitions - Schedule of Purchase Price Consideration Allocation (Detail) - USD ($) $ in Thousands | Jul. 19, 2017 | Dec. 31, 2017
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Business Combinations [Abstract] |  |
Fair value of shares issued | $ 20,625 |
Unamortized fair value of Cerulean options | 3,654 |
Fair value of total consideration | 24,279 |
Assets acquired and liabilities assumed |  |
Cash and cash equivalents | 9,918 |
Prepaid expense and other current assets | 1,915 |
Accounts payable | (233) |
Total assets acquired and liabilities assumed | 11,600 |
Goodwill | $ 12,679 | $ 5,200

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- Definition Business combination reverse merger recognized identifiable assets acquired and liabilities assumed cash and equivalents. + References No definition available. + Details
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- Definition Business combination reverse merger recognized identifiable assets acquired and liabilities assumed net. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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