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Non-Controlling Interests (Tables) | 12 Months Ended
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Dec. 31, 2017
Noncontrolling Interest [Abstract] |
Summary of Non-Controlling Interests | As of each balance sheet date, non-controlling interests’ balances were as follows (in thousands):
|  | December 31, |
Entity |  | 2017 |  |  | 2016 |
Spero Potentiator |  | $ | — |  |  | $ | (5,470 | )
Spero Europe |  |  | — |  |  |  | (21 | )
Spero Gyrase |  |  | 355 |  |  |  | 380 |
Spero Cantab |  |  | — |  |  |  | 1,303 |
|  | $ | 355 |  |  | $ | (3,808 | )

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- Definition The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- References No definition available. + Details
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