Income Taxes - Schedule of Reconciliation of Income Taxes at Statutory Federal Income Tax Rate to Net Income Taxes (Detail) - USD ($) |
12 Months Ended | ||
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Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Income Tax Disclosure [Abstract] | |||
| U.S. federal taxes (benefit) at statutory rate | $ 14,900,000 | $ (7,407,000) | $ (9,592,000) |
| State federal income tax benefit | (448,000) | (571,000) | (1,794,000) |
| Unutilized (utilized) net operating losses | (11,287,000) | 9,809,000 | 9,747,000 |
| Stock-based compensation | 898,000 | 730,000 | 486,000 |
| Research and development credits | (3,135,000) | (952,000) | (1,416,000) |
| Tax assets not benefited | 4,732,000 | 1,322,000 | 1,926,000 |
| Nondeductible warrant expense | (5,703,000) | (3,177,000) | 790,000 |
| Other | 43,000 | 44,000 | 55,000 |
| Total | $ 0 | $ (202,000) | $ 202,000 |
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- Definition Income tax reconciliation tax assets not benefited. No definition available.
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- Definition Income tax reconciliation unutilized utilized net operating losses. No definition available.
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- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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