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Warrants (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Feb. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Warrants Narrative Details |  |  |  |  |  |
Common shares underlying warrants |  |  | 3,761 | 5,039 | 6,526 | 8,091
Warrant exercise price, per share |  |  | $ 2.23 | $ 3.34 | $ 3.08 |
Loss on warrant exchange |  |  | $ 0 | $ 0 | $ (4,967) |
Warrant Transactions Connected with Contingently Convertible Securities | The warrants to purchase 2.1 million shares of our common stock that we sold in our March 2014 offering have an exercise price of $2.47 per share and expire on the fifth anniversary of the date of issuance. | In February 2014, we issued 3.7 million shares of our common stock under the exchange provision of our then-outstanding warrants. We did not receive additional cash consideration in the exchange transaction. We recorded a loss of $5.0 million during the year ended December 31, 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 from December 31, 2013 to the date the warrants were exchanged. |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Information regarding derivative transactions entered into in connection with the issuance of contingently convertible securities that may be useful in explaining the potential impact of the contingently convertible securities. This information may include the terms of the derivative transaction (including settlement terms), how the transactions relate to the contingently convertible securities, and the number of shares underlying the derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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