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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Dispose, impair or recognition of additional goodwill |  | $ 0 | $ 0 |  |  |
Goodwill |  | 1,316,000 | 1,316,000 |  | 1,316,000 | [1]
Impairment charges on goodwill | 0 |  |  |  |  |
Impairment losses recognized related to the acquired intangible assets |  | 0 |  | 0 |  |
Annual amortization expense of the intangible assets, 2014 (remaining three months) |  | 50,000 | 50,000 |  |  |
Annual amortization expense of the intangible assets, 2015 |  | 200,000 | 200,000 |  |  |
Annual amortization expense of the intangible assets, 2016 |  | 200,000 | 200,000 |  |  |
Annual amortization expense of the intangible assets, 2017 |  | 200,000 | 200,000 |  |  |
Annual amortization expense of the intangible assets, 2018 |  | 200,000 | 200,000 |  |  |
Annual amortization expense of the intangible assets, 2019 |  | 200,000 | 200,000 |  |  |
Annual amortization expense of the intangible assets, 2020 |  | $ 100,000 | $ 100,000 |  |  |
[1] | The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.

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