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Fair Value of Warrants Using Valuation Model (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
2009 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Expected term (in years) | 1 year 1 month 24 days | 1 year 7 months 24 days
Estimated volatility | 41.00% | 45.00%
Risk-free interest rate | 0.15% | 0.25%
Expected dividend yield | 0.00% | 0.00%
2010 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Expected term (in years) | 2 years 4 months 10 days | 2 years 10 months 10 days
Estimated volatility | 42.00% | 51.00%
Risk-free interest rate | 0.36% | 0.36%
Expected dividend yield | 0.00% | 0.00%

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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 (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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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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