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Non-Controlling Interests (Tables)
 12 Months Ended
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 )