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Common Stock (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Feb. 28, 2014 | Sep. 30, 2013 | May 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common Stock Narrative Details |  |  |  |  |  |  |  |
Number of shares of common stock issued | 1,400,000us-gaap_StockIssuedDuringPeriodSharesNewIssues | 7,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues | 3,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues | 3,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues | 2,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Cash received from stock sale, before issuance costs | $ 2,900,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 13,900,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 0us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 6,600,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 5,850,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 16,114,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 4,262,000us-gaap_StockIssuedDuringPeriodValueNewIssues |
Stock issuance costs | $ 158,000us-gaap_PaymentsOfStockIssuanceCosts | $ 1,000,000us-gaap_PaymentsOfStockIssuanceCosts |  | $ 452,000us-gaap_PaymentsOfStockIssuanceCosts | $ 362,000us-gaap_PaymentsOfStockIssuanceCosts |  |  |
Common shares underlying warrants |  | 2,100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  | 6,526,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 8,091,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 5,131,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Warrant exercise price, per share |  | $ 2.47us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  | $ 3.08us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 3.07us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 7.28us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Date from which warrants are exercisable |  | Sep. 30, 2014 |  |  |  |  |  |
Warrant term, in years |  | 5 years |  |  |  |  |  |
Terms and provisions | In June 2014, we entered into an At-the-Market (ATM) equity agreement with Meyers Associates, L.P. Under the agreement we may from time to time, at our discretion offer and sell shares of our common stock having an aggregate value of up to $4.5 million. As of December 31, 2014 we have received proceeds of approximately $3.5 million before issuance costs of approximately $175,000 from the sale of 1.7 million shares of our common stock. | In March 2014, we raised $13.9 million before issuance costs of approximately $1.0 million through an underwritten offering of 7.2 million shares of our common stock and warrants to purchase 2.1 million shares of our common stock. Details of the warrants are described below in Note 9. | In February 2014, we issued 3.7 million shares of our common stock under the exchange provisions of warrants issued in our May and September 2013 registered direct offerings. We recognized a loss of $5.0 million on the exchange as the fair market value of the common stock issued was greater than the obligation recorded due to an increase in our stock price since December 31, 2013. Details of the warrants are described below in Note 9. | In September 2013, we raised $6.6 million before issuance costs of approximately $452,000 from the sale of 3.5 million shares of common stock and warrants to purchase up to an aggregate of 2.1 million shares of our common stock in a registered direct offering. Details of the warrants are described below in Note 9. | In May 2013, we raised $5.85 million before issuance costs of approximately $362,000 from the sale of 2.6 million shares of common stock and warrants to purchase up to an aggregate of 2.0 million shares of our common stock in a registered direct offering. Details of the warrants are described below in Note 9. |  |  |

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