| Balance Sheet Details - Amortization of Company's Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | 
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| Supplemental Balance Sheet Disclosures [Abstract] | ||
| 2015 | $ 589us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths | |
| 2016 | 382us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo | |
| 2017 | 270us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree | |
| 2018 | 270us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour | |
| 2019 | 270us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive | |
| Thereafter | 1,305us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive | |
| Total | $ 3,086us-gaap_FiniteLivedIntangibleAssetsGross | $ 749us-gaap_FiniteLivedIntangibleAssetsGross | 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available. 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available. 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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