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Subsequent Events - Additional Information (Detail) (USD $)
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1 Months Ended | 1 Months Ended | ||||||
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Jun. 30, 2014
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Dec. 31, 2013
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Jul. 31, 2014
Subsequent Event [Member]
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Jul. 31, 2014
Series B [Member]
Subsequent Event [Member]
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Jul. 31, 2014
Underwritten Public Offering [Member]
Series A [Member]
Subsequent Event [Member]
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Jul. 31, 2014
Underwritten Public Offering [Member]
Series B [Member]
Subsequent Event [Member]
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Jul. 31, 2014
Series A Warrant [Member]
Underwritten Public Offering [Member]
Subsequent Event [Member]
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Jul. 31, 2014
Series B Warrant [Member]
Series B [Member]
Subsequent Event [Member]
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| Subsequent Event [Line Items] | ||||||||
| Underwritten public offering shares of common stock | 5,559,866 | |||||||
| Issuance of series B pre-funded warrants | 1,587,301 | 1,340,538 | ||||||
| Public offering price of common stock, per share | $ 0.001 | $ 0.001 | $ 3.48 | $ 3.47 | ||||
| Strike price of warrants | $ 0.01 | $ 4.00 | $ 4.00 | |||||
| Common stock purchase right description | Each Series B unit consisted of a Pre-Funded Series B warrant to purchase up to one share of common stock at an initial exercise price of $0.01 per share and a Series B warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share. | Each Series A unit consisted of one share of common stock and a Series A warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share. | ||||||
| Affiliates and certain related parties owning percentage | 9.99% | |||||||
| Net proceeds from issuance of common stock | $ 22,400,000 | |||||||
| Proceeds received in advance | $ 3,174,000 | |||||||