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Subsequent Events - Additional Information (Detail) (USD $) | 3 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |
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Mar. 31, 2014 | Dec. 31, 2013 | May 07, 2014 Subsequent Event [Member] | Apr. 29, 2014 Subsequent Event [Member] | Apr. 25, 2014 Subsequent Event [Member] | Mar. 31, 2014 Subsequent Event [Member] | May 07, 2014 Subsequent Event [Member] Common Stock Warrants [Member] | May 07, 2014 Subsequent Event [Member] Pro Forma [Member] | Mar. 31, 2014 Subsequent Event [Member] Pro Forma [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 1-for-4 reverse stock split |  |  |  | 1-for-5.1 reverse stock split |  |  |  |
Underlying shares of the warrants issued, for which the exercise price was lowered to the IPO price |  |  |  | 53,404 |  |  |  |  |
Exercise price of options, lower range |  |  |  | $ 20.40 |  |  |  |  |
Exercise price of options, upper range |  |  |  | $ 61.20 |  |  |  |  |
Weighted average exercise price of options |  |  |  | $ 54.87 |  |  |  |  |
Agreement date | Apr. 29, 2014 |  |  |  |  |  |  |  |
Number of shares of common stock sold |  |  | 6,200,000 |  |  |  |  |  |
Public offering price per share |  |  | $ 10 |  |  |  |  |  |
Net proceed from initial public offering |  |  | $ 54,800,000 |  |  |  |  |  |
Underwriting discounts and commissions |  |  | 3,300,000 |  |  |  |  |  |
Offering expenses |  |  | 3,900,000 |  |  |  |  |  |
Outstanding debt |  |  | 15,000,000 |  |  |  |  |  |
Number of preferred stock converted into common stock |  |  | 1,967,571 |  |  |  |  |  |
Completion of IPO | May 07, 2014 |  |  |  |  |  |  |  |
Deferred financing costs | 1,608,000 | 2,144,000 | 1,608,000 |  |  |  |  |  |
Number of preferred stock converted into common stock |  |  | 1,691,884 |  |  |  |  | 1,691,884 |
Issuance of shares of common stock pursuant to the exercise of outstanding warrants |  |  | 275,687 |  |  |  |  |  |
Deferred offering costs | 3,645,000 | 1,775,000 | 3,645,000 |  |  |  |  |  |
Derivative liability | $ 9,998,000 | $ 12,237,000 |  |  |  | $ 9,998,000 | $ 9,998,000 |  | $ 0

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