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Property and Equipment - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property Plant And Equipment Useful Life And Values [Abstract] | |||
| Depreciation and amortization expense | $ 1,767,000 | $ 2,053,000 | $ 2,203,000 |
| Capitalized assets | $ 200,000 | ||