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Merger Agreement (Details)
$ in Millions
May 16, 2017
May 15, 2017
USD ($)
director
Business Acquisition [Line Items]    
Number of members on Board of Directors | director   7
Parent Company    
Business Acquisition [Line Items]    
Number of members on Board of Directors | director   2
Synlogic    
Business Acquisition [Line Items]    
Number of members on Board of Directors | director   5
Merger Agreement    
Business Acquisition [Line Items]    
Minimum net cash threshold   $ 33.5
Merger agreement termination fee   2.0
Maximum expense reimbursement required subsequent to termination   $ 1.0
Merger Agreement | Stock subject to lock up agreement    
Business Acquisition [Line Items]    
Restrictions on share transfer following merger, term   180 days
Merger Agreement | Parent Company    
Business Acquisition [Line Items]    
Net cash at closing   $ 40.0
Shares outstanding, percent in support of Merger Agreement   33.00%
Merger Agreement | Parent Company | Stock subject to lock up agreement    
Business Acquisition [Line Items]    
Shares outstanding, percent in support of Merger Agreement   33.00%
Merger Agreement | Synlogic    
Business Acquisition [Line Items]    
Shares outstanding, percent in support of Merger Agreement   77.00%
Merger Agreement | Synlogic | Stock subject to lock up agreement    
Business Acquisition [Line Items]    
Shares outstanding, percent in support of Merger Agreement   81.00%
Merger Agreement | Mirna outstanding common stock | Parent Company    
Business Acquisition [Line Items]    
Share ownership prior to merger, percent   17.00%
Merger Agreement | Mirna outstanding common stock | Synlogic    
Business Acquisition [Line Items]    
Share ownership following merger, percent 83.00%