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Reverse Merger - Narrative (Details)
$ / shares in Units, $ in Thousands
Jun. 30, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Feb. 13, 2017
USD ($)
shares
Feb. 12, 2017
USD ($)
shares
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01    
Common stock, shares outstanding (in shares) | shares 30,595,793 22,568,006    
Preferred stock        
Business Acquisition [Line Items]        
Exchange rate of common stock       1
Signal        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) | shares     21,309,440.00 1,024,960.00
Market capitalization | $       $ 12,600
Net acquired tangible assets | $     $ 204  
Signal | Signal Shares issued to Miragen Common Shareholders        
Business Acquisition [Line Items]        
Exchange rate of common stock     0.7031  
Signal | Pre-Merger MIragen Stockholders, Warrantholders, and Optionholders        
Business Acquisition [Line Items]        
Ownership percentage     95.20%  
Signal | Signal Shareholders        
Business Acquisition [Line Items]        
Ownership interest prior to merger     95.90%  
Signal | Miragen Shareholders        
Business Acquisition [Line Items]        
Ownership interest prior to merger     4.10%