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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2010
USD ($)
Commitments and Contingencies Disclosure [Line Items]          
Minimum term of non-cancellable operating leases 1 year 1 year      
Expiration of non-cancellable operating leases maximum year 2023 2023      
Operating lease, rent expense $ 1.0   $ 0.8 $ 0.8  
Financing for leasehold improvement         $ 1.1
Outstanding liability related to leasehold improvements 0.3        
Purchase commitment, paid 6.7   $ 6.9 $ 7.7  
Future minimum purchase commitment 2018 9.6        
Future minimum purchase commitment 2019 2.4        
Future minimum purchase commitment 2020 2.6        
Future minimum purchase commitment 2021 $ 4.9        
Transition agreement expiration date Sep. 30, 2014 Sep. 30, 2014      
Potential maximum payment of distribution fee | €   € 3,000,000      
Accrued liabilities          
Commitments and Contingencies Disclosure [Line Items]          
Leasehold Improvements reflected in Accrued liabilities $ 0.2        
Other non-current liabilities          
Commitments and Contingencies Disclosure [Line Items]          
Leasehold Improvements reflected in Other non-current liabilities $ 0.1