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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Mar. 31, 2017
Apr. 30, 2017
Feb. 28, 2017
Oct. 31, 2016
Subsequent Event [Line Items]        
Capital lease obligations incurred     $ 0.4  
Capital leases, term of contract     3 years  
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Shares issued (shares)   6,325,000    
Share price (usd per share)   $ 4.00    
Net proceeds from public offering   $ 23.3    
Capital lease obligations incurred   $ 0.3    
Capital leases, term of contract   3 years    
Research and Development Arrangement [Member]        
Subsequent Event [Line Items]        
Purchase commitment $ 0.2     $ 1.4
Research and Development Arrangement [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Purchase commitment   $ 4.3    
Over-Allotment Option | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Shares issued (shares)   825,000