Quarterly report pursuant to Section 13 or 15(d)

Indebtedness (Details)

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Indebtedness (Details) - Equipment Financing Lease - Laboratory equipment - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2018
Dec. 31, 2017
Equipment Financing      
Amount financed $ 0.4    
Interest rate (as a percent) 6.44%    
Term of financing 36 months    
Principal and interest payments made during the period   $ 0.1  
Principal amount outstanding   $ 0.0 $ 0.1