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Warrants (Warrants Classified as Equity) (Detail) - $ / shares |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2016 | May 08, 2013 | Dec. 31, 2016 | Jun. 30, 2017 | Jul. 13, 2016 | May 10, 2016 | Jan. 12, 2016 | Dec. 31, 2015
Warrants and Rights Note Disclosure [Abstract] |  |  |  |  |  |  |  |
Duration of average market price used for warrant exercise price |  | 20 days |  |  |  |  |  |
Exercise price (usd per share) | $ 8.60 | $ 49.4 | $ 79.40 | $ 79.40 | $ 13.00 | $ 30.20 | $ 28.40 | $ 79.40
Warrants outstanding | 50,000 | 9,109 | 100,000 | 15,000 |  | 50,000 |  |
Fair value assumptions, expected volatility rate | 106.63% | 75.34% | 77.13% |  |  |  |  |
Fair value assumptions, expected term (in years) | 5 years 6 months | 7 years | 5 years 6 months |  |  |  |  |
Fair value assumptions, risk free interest rate | 1.35% | 1.20% | 1.26% |  |  |  |  |
Fair value assumptions, expected dividend rate | 0.00% | 0.00% | 0.00% |  |  |  |  |
Fair value of warrants granted (usd per share) |  | $ 38.60 |  |  |  |  |  |
Warrant term |  | 7 years | 5 years |  |  |  |  |

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- Definition Class of warrant or right, number of days averaged for exercise price. + References No definition available. + Details
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- Definition Fair Value of Warrants Granted, per Share + References No definition available. + Details
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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 Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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