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Subsequent Events - Additional Information (Detail) (USD $) | 9 Months Ended |  | 1 Months Ended |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Nov. 30, 2008 Warrant liabilities [Member] | Sep. 30, 2013 Series A Warrants [Member] | Oct. 31, 2013 Subsequent Events [Member] | Sep. 30, 2013 Subsequent Events [Member] | Oct. 31, 2013 Subsequent Events [Member] Warrant liabilities [Member] | Sep. 30, 2013 Subsequent Events [Member] Series A Warrants [Member] | Oct. 31, 2013 Subsequent Events [Member] Stem Cell Sciences (U.K.) Ltd [Member] Patents | Oct. 31, 2013 Subsequent Events [Member] Common Stock [Member] | Sep. 30, 2013 Subsequent Events [Member] Common Stock [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock and warrants |  |  |  |  |  | 12,845,500 |  |  |  |  |  |
Sale of common stock and warrant, price per share |  |  |  |  |  | $ 1.45 |  |  |  |  |  |
Proceeds from issuance of common stock and warrants |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |
Common stock, par value | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |
Number of shares of common stock or warrant in each unit sold to institutional investors |  |  |  | 1 |  |  |  | 1 |  |  | 1 |
Number of securities callable by each warrant or right warrants |  |  |  |  |  |  |  |  |  |  | 0.5 |
Warrant exercise price |  |  |  |  | 1.40 | 1.80 |  |  | 1.40 |  |  |
Warrant expiration period |  |  |  |  |  | 5 years |  |  |  |  |  |
Warrant exercise shares |  |  |  |  |  |  |  |  | 50,000 |  |  |
Proceeds from the exercise of warrants | $ 460,097 | $ 4,153,584 |  |  |  |  | $ 70,000 |  |  |  |  |
Warrant common stock share issued |  |  |  |  |  |  |  |  |  |  |  | 50,000
Number of patents acquired |  |  |  |  |  |  |  |  |  | 6 |  |
Shares issued | 329,131 |  |  |  |  |  |  |  |  | 139,548 |  |

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