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Acquisitions - Schedule of Purchase Price Consideration Allocation (Detail) - USD ($) $ in Thousands	Jul. 19, 2017	Dec. 31, 2017
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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Business combination reverse merger consideration transferred.

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Business combination reverse merger consideration transferred equity interests issued and issuable.

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Business combination reverse merger recognized identifiable assets acquired and liabilities assumed cash and equivalents.

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- Definition

Business combination reverse merger recognized identifiable assets acquired and liabilities assumed current assets prepaid expense and other current assets.

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Business combination reverse merger recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable.

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Business combination reverse merger recognized identifiable assets acquired and liabilities assumed net.

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Business combination reverse merger recognized identifiable assets acquired and liabilities assumed net.

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Business combination reverse merger unamortized fair value of stock options.

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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.

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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

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