Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) € / Unit	Dec. 31, 2015 EUR (€) € / Unit	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2015 EUR (€)
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	2020	2020
Operating lease, rent expense	$ 0.8		$ 0.8	$ 0.7
Financing for leasehold improvement					$ 1.1
Outstanding liability related to leasehold improvements	0.5
Purchase commitment, paid	7.7		$ 6.8	$ 6.5
Future minimum purchase commitment 2016	8.4
Future minimum purchase commitment 2017	$ 0.7
Transition agreement expiration date	Sep. 30, 2014	Sep. 30, 2014
Distribution fee per disposable kit | € / Unit	10	10
Potential maximum payment of distribution fee | €		€ 3,000,000
Distribution related expense paid	$ 0.5	€ 400,000
Distribution related expense accrued	0.1					€ 100,000
Accrued liabilities
Commitments and Contingencies Disclosure [Line Items]
Leasehold Improvements reflected in Accrued liabilities	0.1
Other non-current liabilities
Commitments and Contingencies Disclosure [Line Items]
Leasehold Improvements reflected in Other non-current liabilities	$ 0.4