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Stock-Based Compensation - Additional Information (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||
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Apr. 22, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 30, 2014
Employees
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Sep. 30, 2013
Employees
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Sep. 30, 2014
Employees
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Sep. 30, 2013
Employees
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Sep. 30, 2014
Two Thousand Three Plan
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Sep. 18, 2003
Two Thousand Three Plan
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Sep. 30, 2014
Two Thousand Three Plan
Maximum
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Dec. 31, 2010
Amended Two Thousand Three Plan
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May 12, 2014
2013 Stock Incentive Plan
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Sep. 30, 2014
2013 Stock Incentive Plan
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Sep. 30, 2014
Employee Restricted Stock Plan
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Apr. 21, 2014
Restricted Stock
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Sep. 30, 2014
Restricted Stock
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Dec. 31, 2013
Restricted Stock
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Apr. 21, 2014
Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||
| Common stock reserved for future issuance | 450,000 | 1,160,000 | 3,000,000 | 300,000 | |||||||||||||||||
| Shares of common stock vested and exercisable | 399,020 | ||||||||||||||||||||
| Shares of common stock unvested | 52,500 | ||||||||||||||||||||
| Percentage of option price | 100.00% | ||||||||||||||||||||
| Stock option period | 10 years | 10 years | 10 years | ||||||||||||||||||
| Common stock vesting period | 3 years | 3 years | 3 years | 3 years | |||||||||||||||||
| Additional common stock reserved for future issuance | 1,000,000 | ||||||||||||||||||||
| Number of options granted | 52,500 | 0 | 52,500 | ||||||||||||||||||
| Number of options exercised | 0 | ||||||||||||||||||||
| Intrinsic value of outstanding exercisable options | $ 0 | $ 0 | $ 98,000 | ||||||||||||||||||
| Weighted average term | 3 years | ||||||||||||||||||||
| Common stock reserved for future issuance | 848,000 | 1,257,500 | |||||||||||||||||||
| Restricted shares forfeited under stock incentive plan | 50,000 | 26,000 | |||||||||||||||||||
| Weighted average grant date fair value | $ 1.94 | ||||||||||||||||||||
| Shares available for issuance under stock incentive plan | 636,453 | 636,453 | 680,953 | 970,500 | |||||||||||||||||
| Unrecognized compensation expense for restricted stock | 2,250,000 | 2,250,000 | 1,019,000 | ||||||||||||||||||
| Stock-based compensation | $ 227,000 | $ 53,000 | $ 588,000 | $ 754,000 | $ 263,000 | $ 53,000 | $ 613,000 | $ 754,000 | |||||||||||||