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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) - $ / shares |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2016 | Dec. 01, 2014 | Oct. 01, 2014 | Aug. 14, 2014 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2015 | Mar. 31, 2016
Derivative [Line Items] |  |  |  |  |  |  |  |
Underlying price on valuation date |  | $ 2.50 | $ 2.50 | $ 2.50 | $ 2.50 | $ 2.50 | $ 2.50 | $ 1.25
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Percentage of shares purchased by private investor |  |  |  |  |  | 24.00% |  |
Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Underlying price on valuation date | $ 1.25 |  |  | 2.50 | 2.50 |  | 2.50 |
Contractual conversion rate | $ 3.15 |  |  | $ 3.10 | $ 3.15 |  | $ 3.15 |
Contractual term to maturity | 1 year 9 months 26 days |  |  | 2 years |  |  | 2 years |
Implied expected term to maturity | 1 year 2 months 27 days |  |  | 1 year 10 months 6 days |  |  | 1 year 9 months 26 days |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities |  |  |  | 3.00% |  |  |  |
Range of equivalent volatilities | 120.10% |  |  | 51.20% |  |  | 98.10% |
Contractual interest rate | 11.00% |  |  |  | 11.00% |  | 11.00% |
Range of equivalent market risk adjusted interest rates | 11.60% |  |  | 9.50% | 11.00% |  | 11.00% |
Range of equivalent credit risk adjusted yields | 4.13% |  |  | 4.15% | 3.76% |  | 3.76% |
Range of equivalent credit risk adjusted yields | 4.13% |  |  | 4.15% | 3.76% |  | 3.76% |
Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Underlying price on valuation date | $ 1.25 |  | 2.50 |  | $ 2.50 |  | $ 2.50 |
Contractual conversion rate | $ 3.15 |  | $ 3.15 |  | $ 3.15 |  | $ 3.15 |
Contractual term to maturity | 1 year 9 months 26 days |  | 2 years |  |  |  | 2 years |
Implied expected term to maturity | 1 year 2 months 27 days |  | 1 year 9 months 15 days |  |  |  | 1 year 9 months 26 days |
Market volatility: |  |  |  |  |  |  |  |
Range of equivalent volatilities | 120.10% |  | 68.00% |  |  |  | 98.10% |
Contractual interest rate | 11.00% |  |  |  | 11.00% |  | 11.00% |
Range of equivalent market risk adjusted interest rates | 11.60% |  | 9.25% |  | 11.00% |  | 11.00% |
Range of equivalent credit risk adjusted yields | 4.13% |  | 4.24% |  | 3.76% |  | 3.76% |
Range of equivalent credit risk adjusted yields | 4.13% |  | 4.24% |  | 3.76% |  | 3.76% |
Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Underlying price on valuation date | $ 1.25 | 2.50 |  |  | $ 2.50 |  | $ 2.50 |
Contractual conversion rate | $ 3.15 | $ 3.10 |  |  | $ 3.15 |  | $ 3.15 |
Contractual term to maturity | 1 year 9 months 26 days | 2 years |  |  | 2 years |  |  |
Implied expected term to maturity | 1 year 2 months 27 days | 1 year 9 months 4 days |  |  | 1 year 9 months 26 days |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of equivalent volatilities | 120.10% | 72.20% |  |  | 98.10% |  |  |
Contractual interest rate | 11.00% |  |  |  | 11.00% |  | 11.00% |
Range of equivalent market risk adjusted interest rates | 11.60% | 9.25% |  |  | 11.00% |  | 11.00% |
Range of equivalent credit risk adjusted yields | 4.13% | 4.52% |  |  | 3.76% |  | 3.76% |
Range of equivalent credit risk adjusted yields | 4.13% | 4.52% |  |  | 3.76% |  | 3.76% |
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 96.00% |  |  | 37.00% |  |  | 85.20% |
Contractual interest rate |  |  |  | 8.00% |  |  |  |
Range of equivalent credit risk adjusted yields | 3.49% |  |  | 3.94% | 3.29% |  | 3.29% |
Range of equivalent credit risk adjusted yields | 3.49% |  |  | 3.94% | 3.29% |  | 3.29% |
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 96.00% |  | 58.60% |  |  |  | 85.20% |
Contractual interest rate |  |  | 8.00% |  |  |  |  |
Range of equivalent credit risk adjusted yields | 3.49% |  | 3.97% |  | 3.29% |  | 3.29% |
Range of equivalent credit risk adjusted yields | 3.49% |  | 3.97% |  | 3.29% |  | 3.29% |
Minimum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 96.00% | 61.80% |  |  | 85.20% |  |  |
Contractual interest rate |  | 8.00% |  |  |  |  |  |
Range of equivalent credit risk adjusted yields | 3.49% | 4.29% |  |  | 3.29% |  | 3.29% |
Range of equivalent credit risk adjusted yields | 3.49% | 4.29% |  |  | 3.29% |  | 3.29% |
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | First Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 154.00% |  |  | 62.20% |  |  | 109.80% |
Contractual interest rate |  |  |  | 11.00% |  |  |  |
Range of equivalent credit risk adjusted yields | 5.02% |  |  | 4.45% | 4.22% |  | 4.22% |
Range of equivalent credit risk adjusted yields | 5.02% |  |  | 4.45% | 4.22% |  | 4.22% |
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 154.00% |  | 75.30% |  |  |  | 109.80% |
Contractual interest rate |  |  | 11.00% |  |  |  |  |
Range of equivalent credit risk adjusted yields | 5.02% |  | 4.61% |  | 4.22% |  | 4.22% |
Range of equivalent credit risk adjusted yields | 5.02% |  | 4.61% |  | 4.22% |  | 4.22% |
Maximum [Member] | Monte Carlo Simulations [Member] | Monaco Notes [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |
Range of volatilities | 154.00% | 79.80% |  |  | 109.80% |  |  |
Contractual interest rate |  | 11.00% |  |  |  |  |  |
Range of equivalent credit risk adjusted yields | 5.02% | 4.84% |  |  | 4.22% |  | 4.22% |
Range of equivalent credit risk adjusted yields | 5.02% | 4.84% |  |  | 4.22% |  | 4.22% |

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