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Non-Controlling Interests - Summary of Non-Controlling Interests (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Noncontrolling Interest [Line Items] |  |
Non-controlling interests | $ 355,000 | $ (3,808,000)
Spero Potentiator, Inc. [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests | 0 | (5,470,000)
Spero Europe, Ltd. [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests | 0 | (21,000)
Spero Gyrase, Inc. [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests | 355,000 | 380,000
Spero Cantab [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests | $ 0 | $ 1,303,000

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Details
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