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Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax (benefit) rate | (34.00%) | (34.00%) | (34.00%)
State income tax (benefit) rate | (0.60%) |  |
Increase resulting from: |  |  |
Expenses not deductible for taxes | 0.10% | 0.80% | 0.50%
Increase in valuation allowance | 36.00% | 32.60% | 38.80%
Change in state deferred tax rate | (2.20%) | 0.00% | 1.10%
Change in foreign deferred tax rate | 0.30% | 2.80% | 0.90%
Expiration of tax attributes | 1.20% | 1.70% | 0.50%
Prior year true up | 2.50% | 1.10% | (0.70%)
Tax credits | (2.50%) | (2.40%) | (3.00%)
Warrant valuation | (0.90%) | (2.50%) | (4.10%)
Effective tax (benefit) rate | 0.00% | 0.00% | 0.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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