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Stock Option and Incentive Plans - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||||
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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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Apr. 29, 2014
2008 Equity Incentive Plan [Member]
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Feb. 26, 2013
2008 Equity Incentive Plan [Member]
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Apr. 29, 2014
2008 Equity Incentive Plan [Member]
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Jul. 31, 2008
2008 Equity Incentive Plan [Member]
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Feb. 26, 2013
Amended Plan [Member]
Employees
Participant
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Feb. 24, 2014
Amended Plan [Member]
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Feb. 26, 2013
Amended Plan [Member]
Participant
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Dec. 12, 2011
Amended Plan [Member]
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Jul. 28, 2014
2014 Omnibus Incentive Plan [Member]
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Jul. 28, 2014
2014 Omnibus Incentive Plan [Member]
Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||
| Number of shares of common stock reserved pursuant to the plan | 17,421,356 | 17,421,356 | 7,494,848 | 214,285 | 1,857,142 | 1,571,428 | 900,000 | 571,429 | |||||||
| Termination of service, Period | 10 years | 2 years | |||||||||||||
| Exercise price per share, Granted | $ 4.27 | $ 3.50 | |||||||||||||
| Number of participants | 26 | ||||||||||||||
| Number of employees | 20 | ||||||||||||||
| Options to purchase Company's Common Stock | 647,521 | ||||||||||||||
| Number of common stock available for grant | 682,154 | 682,154 | 2,357,142 | ||||||||||||
| Approved grants to purchase shares of Common Stock | 559,285 | ||||||||||||||
| Annual increase of plan, percentage of common stock shares outstanding | 4.00% | ||||||||||||||
| Number of common stock shares outstanding | 2,843,995 | 2,843,995 | 2,221,652 | ||||||||||||
| Weighted average period of unvested stock options | 2 years 4 months 2 days | ||||||||||||||
| Weighted average grant date fair value of options | $ 4.27 | $ 3.50 | |||||||||||||
| Compensation expense recognized | $ 1,249,124 | $ 248,789 | $ 1,630,300 | $ 1,063,709 | |||||||||||
| Unrecognized compensation cost related to unvested stock options | $ 1,762,160 | $ 1,762,160 | |||||||||||||