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Stock Option Plans - Additional Information (Detail) (USD $)
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0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||
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Apr. 05, 2013
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Sep. 30, 2014
stock_plan
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Dec. 31, 2013
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Dec. 31, 2010
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Apr. 05, 2013
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Apr. 05, 2013
Non-Employees [Member]
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Oct. 31, 2013
Non-Employees [Member]
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Apr. 30, 2013
Non-Employees [Member]
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Sep. 30, 2014
Non-Employees [Member]
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Dec. 31, 2010
Non-Employees [Member]
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Sep. 30, 2014
Employees [Member]
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May 31, 2014
Director [Member]
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Sep. 30, 2014
2011 Equity Incentive Plan [Member]
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May 22, 2014
2011 Equity Incentive Plan [Member]
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Jun. 30, 2011
2011 Equity Incentive Plan [Member]
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Sep. 30, 2014
2008 Stock Option Plan [Member]
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Apr. 01, 2010
2008 Stock Option Plan [Member]
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Apr. 29, 2008
2008 Stock Option Plan [Member]
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Apr. 30, 2013
Strike Price of $25.00 or More [Member]
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Apr. 30, 2013
Strike Price of $12.50 [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Number of equity incentive plans | 2 | |||||||||||||||||||
| Options granted maximum exercisable period | 10 years | |||||||||||||||||||
| Shares of common stock reserved for issuance | 350,000 | 550,000 | 251,475 | |||||||||||||||||
| Number of common stock shares authorized for issuance | 2,000,000 | |||||||||||||||||||
| Issuance of shares under Stock Options Plans | 48,000 | 80,000 | 200,000 | |||||||||||||||||
| Shares available for future awards | 893,788 | 51,541 | ||||||||||||||||||
| Stock appreciation rights | 0 | |||||||||||||||||||
| Restricted stock awarded under Stock Option Plans | 122,500 | |||||||||||||||||||
| Stock options strike price | $ 25.00 | $ 25.00 | $ 12.50 | |||||||||||||||||
| Exchange options for number of options held with exercise price equal to initial public offering price, Percentage | 60.00% | 80.00% | ||||||||||||||||||
| Price per share on equity offering | $ 10.00 | $ 10.00 | ||||||||||||||||||
| Outstanding stock options | 1,461,724 | 336,300 | ||||||||||||||||||
| Initial public offering exercisable lower price range | $ 12.50 | |||||||||||||||||||
| Initial public offering exercisable upper price range | $ 33.80 | |||||||||||||||||||
| Initial offering, options exchanged | 242,070 | |||||||||||||||||||
| Exercise price option | $ 10.00 | |||||||||||||||||||
| Approved options issued | 53,500 | |||||||||||||||||||
| Fair value of common stock | $ 9 | $ 13.78 | ||||||||||||||||||
| Unrecognized compensation cost related to non-vested stock options granted | $ 1,047,224 | $ 6,563,115 | ||||||||||||||||||
| Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years) | 3 years 1 month 19 days | 3 years 6 months 14 days | ||||||||||||||||||
| Options exchanged | 30,083 | 164 | 48,000 | 10,000 | ||||||||||||||||
| Exercise price of options exchanged | $ 10.00 | $ 15.39 | $ 15.89 | |||||||||||||||||