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Common Stock - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  | 6 Months Ended | 12 Months Ended |
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Oct. 31, 2013 | Dec. 31, 2011 | Jan. 31, 2011 | Sep. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Institutional Investors [Member] | Oct. 31, 2013 Stem Cell Sciences (U.K.) Ltd [Member] Patents | Oct. 31, 2013 Outstanding warrants [Member] | Nov. 30, 2008 Outstanding warrants [Member] | Dec. 31, 2013 Series A Warrants [Member] | Dec. 31, 2012 Series A Warrants [Member] | Jun. 30, 2012 Series B Warrant [Member] | Dec. 31, 2012 Series B Warrant [Member] | Dec. 31, 2011 Series B Warrant [Member] | Jun. 30, 2012 Series A Warrants [Member] | Dec. 31, 2013 Series A Warrants [Member] | Dec. 31, 2012 Series A Warrants [Member] | Dec. 31, 2011 Series A Warrants [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 December 2011 Financing [Member] Series A Warrants [Member] | Dec. 31, 2012 December 2011 Financing [Member] Series A Warrants [Member] | Oct. 31, 2013 Common Stock [Member] | Jun. 30, 2012 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Dec. 31, 2010 Common Stock [Member] | Jun. 30, 2013 Common Stock [Member] Institutional Investors [Member] | Dec. 31, 2013 Common Stock [Member] December 2011 Financing [Member] | Dec. 31, 2012 Common Stock [Member] December 2011 Financing [Member] | Dec. 31, 2011 Common Stock [Member] December 2011 Financing [Member] Series A Warrants [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  | 225,000,000 | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued in public offering | 12,845,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  | 329,131 | 384,534 | 2,700,000 |
Sale of common stock and warrant, price per share | $ 1.45 |  | $ 10.00 |  | $ 1.91 | $ 2.12 | $ 2.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 1 |  |
Warrant exercise price | 1.80 |  |  |  |  |  |  |  |  |  |  | 1.40 |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40
Warrant expiration period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available to sale |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,645,639 |  |  |
Sale of stock, price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.823 |  |  |
Gross proceeds from common stock |  |  | 9,400,000 |  | 23,491,597 | 19,747,550 | 19,774,820 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise period of rights |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amounts of common stock to sell |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants termination agreement |  |  |  |  | 2013-10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, sold |  |  | 1,000,000 |  | 1,733,771 | 9,647,471 | 525,116 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales agent is paid compensation equal to 3% of gross proceeds |  |  |  |  | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 384,534 |  |  |  |  | 384,534 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  |  |  |  |  |  | 538,000 | 3,078,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  | 2,198,571 |  |  |  | 384,534 | 2,198,571 |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  |  |  | 530,097 | 6,256,438 |  |  |  |  |  |  |  | 3,375,000 |  | 10,000,000 |  |  | 3,078,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 02, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon warrants exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  | 2,700,000 | 2,198,571 |  |  |  |  | 384,534 | 2,198,571 |
Number of warrants issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Warrants issued in public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant date until which warrants exercisable description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Will expire on the fifth anniversary of the closing date of the initial financing transaction in December 2011. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant right and unit combination description |  | Each Unit consists of one share of our common stock and one Series A warrant. Each Series A warrant gives the holder the right to purchase one share of our common stock at an initial exercise price of $1.40 per share. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted to investors |  |  | 6,000,000 |  |  |  | 3,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date value |  |  | $ 10.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options given to investor expiry date |  |  | Feb. 18, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents acquired |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | 139,548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,506,305 | 55,138,311 | 22,427,955 | 12,731,287 |  |  |  |
Fair value of common Stock |  |  |  | $ 200,000 |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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