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Warrant Liability (Details 4) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Summary of outstanding warrants and fair value of warrant liability |  |
Number Outstanding | 9,601,378 |
Fair value | $ 9,035,131 |
Series A Warrants [Member] |  |
Summary of outstanding warrants and fair value of warrant liability |  |
Number Outstanding | 8,166,895 | 8,501,429
Exercise Price per share | $ 1.40 |
Fair value | 8,952,059 |
Warrants issued in 2008 [Member] |  |
Summary of outstanding warrants and fair value of warrant liability |  |
Number Outstanding | 1,034,483 |
Exercise Price per share | $ 23.00 |
Fair value | 14,752 |
Warrants issued in 2009 [Member] |  |
Summary of outstanding warrants and fair value of warrant liability |  |
Number Outstanding | 400,000 |
Exercise Price per share | $ 15.00 |
Fair value | $ 68,320 |

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- Definition Fair value of warrant. + References No definition available. + Details
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- Details
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- Definition Warrant exercise price. + References No definition available. + Details
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Namespace Prefix: | stem_
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Balance Type: | na
Period Type: | instant

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- Definition Warrants outstanding. + References No definition available. + Details
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