Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended					15 Months Ended
	Dec. 31, 2016 USD ($) € / Unit	Dec. 31, 2016 EUR (€) € / Unit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 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	2021	2021
Operating lease, rent expense	$ 0.8		$ 0.8	$ 0.7
Financing for leasehold improvement					$ 1.1
Outstanding liability related to leasehold improvements	0.4
Purchase commitment, paid	6.9		$ 7.7	$ 6.8
Future minimum purchase commitment 2017	6.5
Future minimum purchase commitment 2018	0.6
Future minimum purchase commitment 2019	0.3
Future minimum purchase commitment 2020	0.4
Future minimum purchase commitment 2021	$ 1.7
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	€ 500,000				€ 900,000
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	$ 0.3