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Warrants (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Details) - $ / shares shares in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 19,557 | 2,570
February 2017 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 17,000 | 0
Strike price | $ 1.10 |
Expected term (years) | 4 years 7 months 13 days |
Volatility % | 136.07% |
Risk-free rate % | 1.83% |
July 2016 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 700 | 700
Strike price | $ 13.00 | $ 13.00
Expected term (years) | 4 years 15 days | 4 years 6 months 15 days
Volatility % | 144.12% | 117.82%
Risk-free rate % | 1.73% | 1.82%
January 2016 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 682 | 682
Strike price | $ 28.40 | $ 28.40
Expected term (years) | 3 years 6 months 11 days | 4 years 11 days
Volatility % | 150.15% | 120.38%
Risk-free rate % | 1.64% | 1.71%
March 2015 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 700 | 700
Strike price | $ 41.60 | $ 41.60
Expected term (years) | 2 years 8 months 19 days | 3 years 2 months 19 days
Volatility % | 168.20% | 131.46%
Risk-free rate % | 1.50% | 1.52%
September 2013 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 199 | 199
Strike price | $ 50.00 | $ 50.00
Expected term (years) | 1 year 2 months 19 days | 1 year 8 months 19 days
Volatility % | 100.31% | 164.01%
Risk-free rate % | 1.27% | 1.10%
December 2012 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 152 | 152
Strike price | $ 10.32 | $ 31.60
Expected term (years) | 5 months 23 days | 11 months 23 days
Volatility % | 49.17% | 204.55%
Risk-free rate % | 1.13% | 0.84%
April 2011 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding | 0 | 13
Strike price |  | $ 13.00
Expected term (years) |  | 3 months 22 days
Volatility % |  | 103.79%
Risk-free rate % |  | 0.53%

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- Definition Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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