Stock Options and Warrants - Additional Information2 (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 145 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||||||||||||||||||||||
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Jul. 24, 2013
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Jul. 31, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2008
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Sep. 30, 2013
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Mar. 12, 2013
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Jan. 22, 2013
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Dec. 31, 2012
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Dec. 31, 2007
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Dec. 31, 2006
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Dec. 31, 2007
Minimum [Member]
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Dec. 31, 2007
Maximum [Member]
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Sep. 30, 2013
Maximum [Member]
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Jul. 24, 2013
Series B Warrants [Member]
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Sep. 30, 2013
Series B Warrants [Member]
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Sep. 30, 2013
Common Stock [Member]
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Jul. 24, 2013
Series A Warrants [Member]
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Sep. 30, 2013
Series A Warrants [Member]
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Jul. 19, 2013
Placement Agent Warrants [Member]
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Sep. 30, 2013
Placement Agent Warrants [Member]
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Sep. 30, 2013
U.S. Treasury Notes [Member]
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Jul. 19, 2013
Series B Warrants [Member]
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Sep. 30, 2013
Series B Warrants [Member]
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Sep. 30, 2013
Series B Warrants [Member]
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Jul. 24, 2013
Series B Warrants [Member]
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Sep. 30, 2013
Series B Warrants [Member]
U.S. Treasury Notes [Member]
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Jul. 19, 2013
Series A Warrants [Member]
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Sep. 30, 2013
Series A Warrants [Member]
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Sep. 30, 2013
Series A Warrants [Member]
U.S. Treasury Notes [Member]
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Sep. 30, 2013
Bio Time [Member]
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Sep. 30, 2011
Bio Time [Member]
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Dec. 31, 2011
Bio Time [Member]
Tranches
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Dec. 31, 2008
Bio Time [Member]
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Sep. 30, 2012
Bio Time [Member]
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Jun. 30, 2008
Bio Time [Member]
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Dec. 31, 2011
Bio Time [Member]
Minimum [Member]
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Sep. 30, 2011
Bio Time [Member]
Maximum [Member]
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Dec. 31, 2011
Bio Time [Member]
Maximum [Member]
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Sep. 30, 2013
Series A Preferred Stock [Member]
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Jan. 15, 2008
Series A Preferred Stock [Member]
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Jan. 31, 2013
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Dec. 31, 2010
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Dec. 31, 2008
Series A Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Sep. 30, 2013
Series B Preferred Stock [Member]
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Sep. 30, 2013
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Dec. 31, 2012
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Dec. 31, 2008
Series B Preferred Stock [Member]
Warrants Issued with Preferred Stock [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||
Brookstreet Warrants outstanding | 30,000 | 1,600,000 | 400,000 | 2 | 0 | 300,000 | 2 | ||||||||||||||||||||||||||||||||||||||||||||
Warrant exercised | 0.20 | 0.20 | 0.15 | 0.15 | 0.15 | 0.25 | 0.20 | ||||||||||||||||||||||||||||||||||||||||||||
Expiry date of warrants | Oct. 24, 2013 | Dec. 31, 2012 | Jan. 31, 2013 | Jul. 31, 2013 | |||||||||||||||||||||||||||||||||||||||||||||||
Sale of common stock | 134,169,565 | 134,169,565 | 134,169,565 | 5,000,000 | 10,125,000 | 87,388,815 | 1,370,000 | 1,350,000 | 20,000,000 | 800,000 | 1 | 1 | |||||||||||||||||||||||||||||||||||||||
Shares issued | 2,500,000 | 5,062,500 | 1,700,000 | 20,000,000 | 1,700,000 | ||||||||||||||||||||||||||||||||||||||||||||||
Class of warrant or right term | 5 years | 65 days | 5 years | 5 years | |||||||||||||||||||||||||||||||||||||||||||||||
Number of units issued | 20,000,000 | 1,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||
Maturity term | 5 years | ||||||||||||||||||||||||||||||||||||||||||||||||||
Warrants exercise price | $ 0.15 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Closing bid price of common stock | 80.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||
Warrants expiration date | Oct. 24, 2013 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Number of warrants exercised | 1,700,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Proceeds from issuance of common stock and warrants | $ 2,400,000 | $ 242,000 | $ 242,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
Stock price | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | |||||||||||||||||||||||||||||||||||||||||||||||
Warrant exercise price | $ 0.15 | $ 0.15 | $ 0.15 | ||||||||||||||||||||||||||||||||||||||||||||||||
Stock price volatility | 87.70% | ||||||||||||||||||||||||||||||||||||||||||||||||||
Risk free interest rate | 1.33% | 0.03% | 0.03% | 1.33% | |||||||||||||||||||||||||||||||||||||||||||||||
Period | 0 years | 5 years 7 months 6 days | 6 years 1 month 6 days | 5 years 8 months 12 days | 5 years | 5 years | 3 years | 26 days | 5 years | 5 years | |||||||||||||||||||||||||||||||||||||||||
Capital raised on stock issuance per share | $ 1.00 | $ 0.15 | $ 1 | ||||||||||||||||||||||||||||||||||||||||||||||||
Warrants description | Monte-Carlo simulation method | ||||||||||||||||||||||||||||||||||||||||||||||||||
Fair value of warrant liability in excess of proceeds | 1,390,000 | 1,390,000 | 1,390,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
Fair value of warrants at issuance | 115,000 | 2,650,000 | 2,650,000 | 1,720,000 | |||||||||||||||||||||||||||||||||||||||||||||||
Warrant liabilities | 4,500,000 | 4,400,000 | 4,400,000 | 4,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||
Change in fair value of warrants | 27,000 | 27,000 | 38,000 | (1,330,000) | |||||||||||||||||||||||||||||||||||||||||||||||
Advance | $ 250,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Number of tranches of common stock warrants issuable | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Number of shares which can be purchased by the exercise of warrants | 100,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Strike prices | 2.00 | 1.50 | 2.00 | ||||||||||||||||||||||||||||||||||||||||||||||||
Vesting over four quarters | Four quarters | ||||||||||||||||||||||||||||||||||||||||||||||||||
Options vesting terms | 5 years | ||||||||||||||||||||||||||||||||||||||||||||||||||
Number of warrants vested during period | 100,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Risk free interest rates | 0.00% | 0.88% | 0.95% | 0.94% | 4.58% | 5.13% | |||||||||||||||||||||||||||||||||||||||||||||
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||||||||||||||||||||
Volatility rate minimum | 0.00% | 124.93% | 118.34% | 123.63% | 63.00% | 71.00% | 134.00% |