Stock Options and Warrants - Additional Information2 (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2008
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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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Jun. 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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Jun. 30, 2013
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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Jun. 30, 2013
Series B Preferred stock [Member]
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Jun. 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 | 300,000 | 300,000 | 2 | |||||||||||||||||||||||
Warrant exercised | 0.20 | 0.20 | 0.25 | 0.25 | ||||||||||||||||||||||||||
Expiry date of warrants | Dec. 31, 2012 | Jan. 31, 2013 | Jul. 31, 2014 | |||||||||||||||||||||||||||
Sale of common stock | 112,590,815 | 112,590,815 | 5,000,000 | 10,125,000 | 87,388,815 | 1,370,000 | 1,350,000 | 800,000 | 1 | 1 | ||||||||||||||||||||
Warrant to purchase common stock | 2,500,000 | 5,062,500 | ||||||||||||||||||||||||||||
Class of warrant or right term | 5 years | |||||||||||||||||||||||||||||
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 | 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 | 0.95% | 0.91% | 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 | 118.34% | 124.20% | 118.34% | 124.68% | 63.00% | 71.00% | 134.00% | |||||||||||||||||||||||
Period | 6 years 1 month 6 days | 5 years 7 months 6 days | 6 years 1 month 6 days | 5 years 7 months 6 days | 5 years | 5 years | 3 years | 5 years |