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Derivative Financial Instruments - Significant Assumptions Utilized in Valuation Technique (Detail) (Monte Carlo Simulations [Member], Senior Convertible Notes [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Quoted market price on valuation date | $ 2.29 | $ 2.02
Contractual conversion rate | $ 3.17 | $ 3.17
Range of effective contractual conversion rates |  |
Contractual term to maturity | 1 month 1 day | 3 months 29 days
Implied expected term to maturity | 1 month 1 day | 3 months 29 days
Market volatility: |  |
Range of equivalent volatilities | 27.30% |
Contractual interest rate | 9.00% |
Range of equivalent market risk adjusted interest rates | 9.08% |
Range of equivalent credit risk adjusted yields | 0.64% | 0.67%
Minimum [Member] |  |
Market volatility: |  |
Range of volatilities | 18.20% | 47.40%
Range of equivalent volatilities |  | 59.90%
Contractual interest rate |  | 8.00%
Range of equivalent market risk adjusted interest rates |  | 8.08%
Risk-free rates | 0.03% | 0.01%
Maximum [Member] |  |
Market volatility: |  |
Range of volatilities | 38.40% | 91.20%
Range of equivalent volatilities |  | 69.90%
Contractual interest rate |  | 9.00%
Range of equivalent market risk adjusted interest rates |  | 9.08%
Risk-free rates | 0.05% | 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=25499696&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=25499696&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + 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=25499696&loc=d3e19207-110258 + Details
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