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Stock Based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | ||||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Sep. 30, 2012
Restricted Stock
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Dec. 31, 2011
Restricted Stock
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Sep. 30, 2012
Common Stock
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Aug. 31, 2012
Equity Incentive Plan Twenty Twelve
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Sep. 30, 2012
Equity Incentive Plan Twenty Twelve
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Sep. 30, 2012
Equity Incentive Plan Twenty Twelve
Restricted Stock
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Sep. 30, 2011
Equity Incentive Plan Twenty Twelve
Restricted Stock
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Sep. 30, 2012
Equity Incentive Plan Twenty Twelve
Restricted Stock
Minimum
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Sep. 30, 2012
Equity Incentive Plan Twenty Twelve
Restricted Stock
Maximum
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Sep. 30, 2012
Equity Incentive Plan Twenty Twelve
Non Vested Stock Options
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Sep. 30, 2011
Equity Incentive Plan Twenty Twelve
Non Vested Stock Options
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Aug. 31, 2012
Previously Approved Plans
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Sep. 30, 2012
Previously Approved Plans
Restricted Stock
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Sep. 30, 2012
Previously Approved Plans
Non Vested Stock Options
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Sep. 30, 2011
Previously Approved Plans
Non Vested Stock Options
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Shares initially authorized for issuance under equity incentive plan | 300,000 | |||||||||||||||||||
| Additional shares authorized for issuance under equity incentive plan | 17,666 | |||||||||||||||||||
| Shares ceased to be issuable | 17,666 | |||||||||||||||||||
| Outstanding options to purchase shares of common stock | 433,000 | 433,000 | 546,001 | |||||||||||||||||
| Unvested restricted shares outstanding | 317,001 | |||||||||||||||||||
| Outstanding shares remained available for future grants | 319,333 | |||||||||||||||||||
| Restricted shares outstanding | 317,001 | 232,501 | 0 | |||||||||||||||||
| Weighted average grant-date fair values of options granted | $ 1.28 | $ 1.97 | ||||||||||||||||||
| Aggregate intrinsic value | $ 3,500 | $ 21,007 | $ 665,700 | |||||||||||||||||
| Vesting period | 3 years | 4 years | ||||||||||||||||||
| Share-base compensation expense | 114,000 | 105,000 | 333,000 | 330,000 | ||||||||||||||||
| Unrecognized compensation cost related to the nonvested options | $ 700,000 | $ 793,000 | $ 9,000 | $ 24,504 | $ 9,000 | $ 24,504 | ||||||||||||||
| Unrecognized compensation costs are expected to be recognized over a weighted average period (years) | 1 year 8 months 12 days | 1 year 7 months 6 days | 1 year | 6 months | ||||||||||||||||
| Common stock outstanding | 433,000 | |||||||||||||||||||
| Restricted shares outstanding | 317,001 | |||||||||||||||||||