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Warrants (Narrative) (Details) - $ / shares shares in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Warrants Narrative Details |  |  |  |  |
Common shares underlying warrants |  | 1,973 | 3,761 | 5,039 | 6,526
Warrant exercise price, per share |  | $ 2.47 | $ 2.23 | $ 3.34 | $ 3.08
Warrant Transactions Connected with Contingently Convertible Securities | The outstanding warrants to purchase 2.0 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. | There were no common stock warrants issued in 2017, 2016 or 2015. |  |  |

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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 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=84159872&loc=d3e21506-112644 + Details
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