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Common Stock (Narrative) (Details) (USD $) | 1 Months Ended |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 31, 2012 May 2012 | Jun. 30, 2012 June 2012 | May 31, 2013 May 2013 | Sep. 30, 2013 September 2013
Number of shares of common stock issued | 3,713,309 |  |  |  | 3.3 | 4.2 | 2.6 | 3.5
Cash received from stock sale and warrants before issuance costs |  |  |  |  | $ 5,000,000 | $ 10,500,000 | $ 5,850,000 | $ 6,600,000
Stock issuance costs |  |  |  |  | $ 71,000 | $ 823,000 | $ 362,000 | $ 452,000
Common shares underlying warrants |  | 8,091,000 | 5,131,000 | 2,287,000 | 1.0 | 2.1 | 2.0 | 2.1

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