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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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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 |  |  |  |

X
- Definition Portion of outstanding liability related to leasehold improvement reflected in accrued liabilities. + References No definition available. + Details
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- Definition Outstanding liability related to leasehold improvements current and non current. + References No definition available. + Details
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- Definition Portion of outstanding liability related to leasehold improvement reflected in other non current liabilities. + References No definition available. + Details
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- Definition Agreement Expiration Date + References No definition available. + Details
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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
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- Definition Latest period of expiration of non-cancelable operating lease. + References No definition available. + Details
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- Definition Maximum Termination Penalty + References No definition available. + Details
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- Definition Minimum term of non-cancelable operating lease. + References No definition available. + Details
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- Definition Proceeds from landlord for financing leasehold improvement. + References No definition available. + Details
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- Definition Purchase Commitment Payments + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Details
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- Details
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