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Common Stock - Additional Information (Detail) (USD $) | 9 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 42 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2013 Series A Warrants [Member] | Jun. 30, 2013 Institutional Investors [Member] | Jun. 30, 2013 Common Stock [Member] Institutional Investors [Member] | Jun. 30, 2009 2009 Sales Agreement [Member] | Nov. 30, 2012 2009 Sales Agreement [Member] | Mar. 31, 2013 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2011 December 2011 Financing [Member] Series A Warrants [Member] | Mar. 31, 2013 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2012 December 2011 Financing [Member] Common Stock [Member] | Dec. 31, 2012 2012 Amended Sales Agreement [Member] | Sep. 30, 2013 2012 Amended Sales Agreement [Member] | Sep. 30, 2013 2012 Amended Sales Agreement [Member] Common Stock [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available to sale |  |  |  | $ 30,000,000 |  | $ 30,000,000 |  |  |  |  |  | $ 30,000,000 |  |
Gross proceeds from common stock | 6,115,442 | 16,196,587 |  | 3,000,000 |  |  | 26,700,000 |  |  |  |  |  | 3,317,000 |
Percentage of compensation paid to sales agent |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |
Common stock, sold |  |  |  |  | 1,645,639 |  |  |  |  |  |  |  |  | 1,733,771
Sale of stock, price per share |  |  |  |  | $ 1.823 |  |  |  |  |  |  |  |  | $ 1.91
Number of warrants exercised |  |  |  |  |  |  |  | 334,534 |  |  |  |  |  |
Number of shares issued upon warrants exercise |  |  |  |  | 329,131 |  |  |  |  | 334,534 | 2,700,000 |  |  |
Proceeds from sale of stock |  |  | 468,000 |  |  |  |  | 468,000 | 468,000 |  |  |  |  |
Exercise period of rights |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Additional amounts of common stock to sell |  |  |  | $ 27,000,000 |  |  |  |  |  |  |  |  |  |
Warrants termination agreement | 2013-10 |  |  |  |  |  |  |  |  |  |  |  |  |

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