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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) (USD $) |  | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 Monte Carlo Simulations [Member] Senior Convertible Notes [Member] | Aug. 14, 2014 Monte Carlo Simulations [Member] Monaco Notes [Member] | Sep. 30, 2014 Monte Carlo Simulations [Member] Monaco Notes [Member] | Dec. 31, 2013 Minimum [Member] Monte Carlo Simulations [Member] Senior Convertible Notes [Member] | Aug. 14, 2014 Minimum [Member] Monte Carlo Simulations [Member] Monaco Notes [Member] | Sep. 30, 2014 Minimum [Member] Monte Carlo Simulations [Member] Monaco Notes [Member] | Dec. 31, 2013 Maximum [Member] Monte Carlo Simulations [Member] Senior Convertible Notes [Member] | Aug. 14, 2014 Maximum [Member] Monte Carlo Simulations [Member] Monaco Notes [Member] | Sep. 30, 2014 Maximum [Member] Monte Carlo Simulations [Member] Monaco Notes [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Quoted market price/ underlying price on valuation date | $ 2.50 | $ 2.02 | $ 2.50 | $ 2.50 |  |  |  |  |  |
Contractual conversion rate |  | $ 3.17 |  |  |  |  |  |  |  |
Range of effective contractual conversion rates |  |  |  |  |  |  |  |  |  |
Contractual term to maturity |  | 3 months 29 days | 2 years | 1 year 10 months 13 days |  |  |  |  |  |
Implied expected term to maturity |  | 3 months 29 days | 1 year 10 months 6 days | 1 year 8 months 5 days |  |  |  |  |  |
Market volatility: |  |  |  |  |  |  |  |  |  |
Range of volatilities |  |  |  |  | 47.40% | 37.00% | 55.50% | 91.20% | 62.20% | 70.50%
Range of equivalent volatilities |  |  | 51.20% | 62.30% | 59.90% |  |  | 69.90% |  |
Contractual interest rate |  |  |  |  | 8.00% | 8.00% | 8.00% | 9.00% | 11.00% | 11.00%
Range of equivalent market risk adjusted interest rates |  |  | 9.50% | 9.50% | 8.08% |  |  | 9.08% |  |
Range of equivalent credit risk adjusted yields |  | 0.67% | 4.15% | 4.24% |  | 3.94% | 3.97% |  | 4.45% | 4.61%
Risk-free rates |  |  |  |  | 0.01% |  |  | 0.07% |  |

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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