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Subsequent Event (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Subsequent Event Narrative Details |  |  |
Subsequent Event, Description | In February 2014, we issued 3,713,309 shares of our common stock under the warrant exchange provisions of our May and September 2013 registered direct offerings. Under the warrant exchange provisions, the holders could elect to exchange the warrants for a variable number of shares of common stock as determined by a formula included in the warrants. We did not receive additional cash consideration in the exchange transaction. We expect to record a loss of $5.0 million during the first quarter of 2014 on the exchange, as the fair market value of the common stock issued was greater than the obligation recorded due to the increase in stock price subsequent to year end. |  |
Number of shares of common stock issued | 3,713,309 |  |
Cash received from stock sale, before issuance costs | $ 0 | $ 4,262,000 | $ 14,601,000
Expected loss on warrant exchange | $ 5,000,000 |  |

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