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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
U.S. federal statutory tax rate |  | 34.00% | 34.00% | 34.00%
Valuation allowance |  | $ 6,453,466 | $ 9,028,241 |
Net change in total valuation allowance |  | $ (2,574,764) |  |
Cumulative change in ownership percentage |  | 50.00% |  |
Period for cumulative change in ownership |  | 3 years |  |
Increase in tax expense |  | $ 2,800,000 |  |
Decrease in net deferred tax assets |  | 2,800,000 |  |
Changes in liability for uncertain tax benefits |  | 0 |  |
Income tax interest and penalties accrued |  | 785 | $ 0 |
Income tax interest and penalties |  | $ 785 |  |
Scenario, Plan |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal statutory tax rate | 21.00% |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal statutory tax rate |  | 35.00% |  |
CALIFORNIA |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards |  | $ 5,715,729 |  |
Net operating loss carry forwards, expire period |  | 2028 |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards |  | $ 19,152,650 |  |
Net operating loss carry forwards, expire period |  | 2020 |  |
Tax credit carry forwards |  | $ 936,228 |  |
Tax credit carry forwards, expire period |  | 2026 |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carry forwards |  | $ 1,192,688 |  |

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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=84230637&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=84230637&loc=d3e32559-109319 Reference 3: 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=84230637&loc=d3e32632-109319 + Details
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