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Commitments and Contingencies - Narrative (Details)
ft² in Thousands, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 16, 2015
LegalMatter
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2018
USD ($)
ft²
Loss Contingencies [Line Items]      
Number of class actions filed (in legal matters) | LegalMatter 3    
Number of class actions dismissed (in legal matters) | LegalMatter 2    
Operating leases, rent expense   $ 0.9 $ 2.6
Laboratory And Office Space | Billerica Massachusetts      
Loss Contingencies [Line Items]      
Area of real estate property | ft²   100 100
Warehouse | Billerica Massachusetts      
Loss Contingencies [Line Items]      
Area of real estate property | ft²   29 29
Fees To Former European Distributor | Minimum      
Loss Contingencies [Line Items]      
Commitment due in next twelve months   $ 10.0 $ 10.0
Accrued liabilities   2.0 2.0
Fees To Former European Distributor | Maximum      
Loss Contingencies [Line Items]      
Commitment due in next twelve months   $ 55.0 $ 55.0