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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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| Commitments and Contingencies Disclosure [Abstract] | ||
| Lease expenses | $ 0.6us-gaap_OperatingLeasesRentExpenseNet | $ 0.7us-gaap_OperatingLeasesRentExpenseNet |
| X | ||||||||||
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- Details
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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