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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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| Income Tax Disclosure [Abstract] | |
| Net operating loss carryforward, federal taxes | $ 18,850,000 |
| Net operating loss carryforward, state taxes | $ 12,300,000 |
| Year of expiration of operating loss carryforward, federal taxes | 2029 |
| Year of expiration of operating loss carryforward, state taxes | 2024 |