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Common Stock Issuance (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cash received from stock sale, before issuance costs | $ 20,220,000 | $ 19,356,000
Public December 2018 |  |
Number of shares of common stock issued | 7,000,000 |
Cash received from stock sale, before issuance costs | $ 4,200,000 |
Stock issuance costs | $ 524,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">In December 2018, we raised $4.2 million before issuance costs of approximately $524,000 through an underwritten public offering of 7.0 million shares of our common stock.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> |
Public June 2018 |  |
Number of shares of common stock issued | 14,400,000 |
Cash received from stock sale, before issuance costs | $ 18,000,000 |
Stock issuance costs | $ 1,400,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">In June 2018, we raised $18.0 million before issuance costs of approximately $1.4 million through an underwritten public offering of 14.4 million shares of our common stock.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> |
Public August 2017 |  |
Number of shares of common stock issued | 5,500,000 |
Cash received from stock sale, before issuance costs | $ 11,500,000 |
Stock issuance costs | $ 1,100,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">In August 2017, we raised approximately $11.5 million before issuance costs of approximately $1.1 million through an underwritten public offering of 5.5 million shares of our common stock.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> |
Private Aug 2017 |  |
Number of shares of common stock issued | 1,500,000 |
Cash received from stock sale, before issuance costs | $ 3,200,000 |
Stock issuance costs | $ 26,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">In August 2017, we raised $3.2 million before issuance costs of approximately $26,000 through a private placement of 1.5 million shares of our common stock.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> |
Warrant Exercise 2nd Quarter 2017 |  |
Number of shares of common stock issued | 460,000 |
Cash received from stock sale, before issuance costs | $ 906,000 |
Terms and provisions | <p style="margin: 0"><font style="font-size: 10pt"></font></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">During the second quarter of 2017, we received $906,000 from the exercise of warrants to purchase 460,000 shares of common stock, which warrants were issued in connection with earlier financing transactions.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="margin: 0"><font style="font-size: 10pt"> </font></p> <p style="margin: 0"></p> <p style="margin: 0"><font style="font-size: 10pt"> </font></p> |
ATM Agreement Terminated June 2017 2nd Quarter 2017 |  |
Number of shares of common stock issued | 1,700,000 |
Cash received from stock sale, before issuance costs | $ 3,700,000 |
Stock issuance costs | $ 125,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">During the second quarter of 2017, we received gross proceeds of $3.7 million before issuance costs of approximately $125,000 from the sale of 1.7 million shares of our common stock under an ATM agreement that was terminated in June 2017 at our election without penalty.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> |
Agreement Terminated August 2017 2nd Quarter 2017 |  |
Number of shares of common stock issued | 1,200,000 |
Cash received from stock sale, before issuance costs | $ 2,200,000 |
Terms and provisions | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">During the second quarter of 2017, we received proceeds of $2.2 million from the sale of 1.2 million shares of our common stock as part of a common stock purchase agreement entered into in September 2016 that was terminated in August 2017 at our election without penalty.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin: 0"> </p> |

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