Dilutive Shares Which Could Exist Pursuant to Exercise of Outstanding Stock Instruments and Which were not Included in Calculation (Detail)
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3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Dilutive shares not included in calculation | 11,421,214 | 13,704,230 |
Warrant
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||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Dilutive shares not included in calculation | 5,505,579 | 7,429,241 |
Stock Option
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Dilutive shares not included in calculation | 3,365,198 | 3,656,217 |
Contingently Issuable Shares
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||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Dilutive shares not included in calculation | 2,550,437 | 2,618,772 |