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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
U.S. federal statutory tax rate | 34.00% | 34.00% | 34.00%
Valuation allowance | $ 9,028,241 | $ 11,103,399 |
Net change in total valuation allowance | $ (2,075,158) |  |
Cumulative change in ownership percentage | 50.00% |  |
Period for cumulative change in ownership | 3 years |  |
Changes in liability for uncertain tax benefits | $ 0 |  |
Income tax interest and penalties accrued | 0 | $ 0 |
Income tax interest and penalties | 0 |  |
CALIFORNIA |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | $ 7,873,156 |  |
Net operating loss carry forwards, expire period | 2017 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | $ 17,914,514 |  |
Net operating loss carry forwards, expire period | 2020 |  |
Tax credit carry forwards | $ 1,716,398 |  |
Tax credit carry forwards, expire period | 2026 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carry forwards | $ 1,346,874 |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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