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Stock Based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Restricted Stock
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Dec. 31, 2013
Restricted Stock
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Jun. 30, 2014
Restricted Stock
Service Based Options
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Jun. 30, 2014
Restricted Stock
Performance Contingent Restricted Shares
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Jun. 30, 2014
Restricted Stock
Minimum
Service Based Options
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Jun. 30, 2014
Restricted Stock
Maximum
Service Based Options
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Aug. 31, 2012
2012 Equity Incentive Plan
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Jun. 30, 2014
2012 Equity Incentive Plan
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Aug. 31, 2012
2012 Equity Incentive Plan
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Aug. 31, 2012
Previously Approved Plans
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Jun. 30, 2014
2012 Plan and Previously Approved Plans
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Jun. 30, 2014
2012 Plan and Previously Approved Plans
Restricted Stock
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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 | 119,000 | 119,000 | 279,000 | 119,000 | |||||||||||||
| Unvested restricted shares outstanding | 379,657 | 318,600 | 103,494 | 276,163 | 379,657 | ||||||||||||
| Outstanding shares remained available for future grants | 245,660 | ||||||||||||||||
| Non-cash stock-based compensation expense | $ 33,000 | $ 59,000 | $ 124,000 | $ 164,000 | |||||||||||||
| Aggregate pre-tax intrinsic value | 347,000 | ||||||||||||||||
| Unvested options | 0 | 0 | |||||||||||||||
| Unrecognized compensation cost related to unvested options | 0 | 0 | 739,107 | ||||||||||||||
| Vesting period | 3 years | 4 years | |||||||||||||||
| Vested | 103,503 | ||||||||||||||||
| Intrinsic value of shares vested | 384,500 | ||||||||||||||||
| Cancelled | 34,793 | ||||||||||||||||
| Payment for withholding tax for cancellation of restricted shares | 129,000 | 49,000 | 129,000 | ||||||||||||||
| Unrecognized stock-based compensation expense are expected to be recognized over a weighted average periods (years) | 2 years 1 month 6 days | ||||||||||||||||
| Restricted shares outstanding expected to vest | 268,985 | ||||||||||||||||
| Aggregate intrinsic value | 831,164 | ||||||||||||||||
| Stock-based compensation reversal of previously recognized expense | $ 91,500 | ||||||||||||||||