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Fair Value Measurements (Reconciliation Of Changes In The Fair Value Of Liabilities) (Details) (Warrant Liabilities [Member], USD $)
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9 Months Ended | |
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Sep. 30, 2013
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Sep. 30, 2012
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Warrant Liabilities [Member]
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance at January 1 | $ 2,842,065 | $ 868,725 |
| Additions | 1,406,441 | |
| Unrealized gains (losses) | 1,055,649 | 655,545 |
| Unrealized gains on expiration | (144) | |
| Transfers out of level 3 | (1,111,795) | |
| Balance at June 30 | $ 4,192,216 | $ 1,524,270 |