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Warrants - (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Detail) - $ / shares shares in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding | 19,557 | 2,570 | 1,116 | 428
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 | 0 |
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 | 0 |
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 | 700 | 0
Strike price | $ 41.60 | $ 41.60 | $ 41.60 |
Expected term (years) | 2 years 8 months 19 days | 3 years 2 months 19 days | 4 years 2 months 19 days |
Volatility % | 168.20% | 131.46% | 75.85% |
Risk-free rate % | 1.50% | 1.52% | 1.58% |
September 2013 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding | 199 | 199 | 199 | 199
Strike price | $ 50.00 | $ 50.00 | $ 50.00 |
Expected term (years) | 1 year 2 months 19 days | 1 year 8 months 19 days | 2 years 8 months 19 days |
Volatility % | 100.31% | 164.01% | 74.70% |
Risk-free rate % | 1.27% | 1.10% | 1.24% |
December 2012 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding | 152 | 152 | 152 | 152
Strike price | $ 10.32 | $ 31.60 | $ 31.60 |
Expected term (years) | 5 months 23 days | 11 months 23 days | 1 year 11 months 23 days |
Volatility % | 49.17% | 204.55% | 76.37% |
Risk-free rate % | 1.13% | 0.84% | 1.05% |
April 2011 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding | 0 | 13 | 31 | 31
Strike price |  | $ 13.00 | $ 13.00 |
Expected term (years) |  | 3 months 22 days | 1 year 3 months 22 days |
Volatility % |  | 103.79% | 65.60% |
Risk-free rate % |  | 0.53% | 0.77% |
March 2011 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding |  | 0 | 9 | 9
Strike price |  |  | $ 13.00 |
Expected term (years) |  |  | 2 months 5 days |
Volatility % |  |  | 47.98% |
March 2010 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants outstanding |  | 0 | 1 | 1
Strike price |  |  | $ 40.04 |
Expected term (years) |  |  | 2 months 27 days |
Volatility % |  |  | 71.41% |

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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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