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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Parenthetical) (Detail) - $ / shares | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 01, 2014 | Oct. 01, 2014 | Aug. 14, 2014
Derivative [Line Items] |  |  |  |  |  |
Underlying price per share used in the MCS calculations | $ 2.50 | $ 1.25 | $ 2.50 | $ 2.50 | $ 2.50 | $ 2.50
New option price |  | $ 1.00 |  |  |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Percentage of shares purchased by private investor | 24.00% |  |  |  |  |
Per share value of shares purchased by private investor | $ 2.50 |  |  |  |  |

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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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- Details
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