Fair Value Measurements (Reconciliation Of Changes In The Fair Value Of Liabilities) (Details) - Warrant Liabilities [Member] - USD ($) |
9 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance | $ 2,739,163 | $ 3,768,351 |
| Additions | 4,364,110 | |
| Unrealized gains, net | (3,941,682) | (2,282,476) |
| Transfers out of level 3 | (9,378) | |
| Balance | $ 3,161,591 | $ 1,476,497 |