Cumulative change in ownership percentage.

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Deferred tax assets tax credit carry forward expiration year.

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Income taxes line Items.

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Net Operating Loss Carryforward Expiration Year

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- Definition

Operating loss carryforwards available to offset future taxable income.

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No definition available.

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Percentage of future taxable income offset by operating loss carryforwards.

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Period for cumulative change in ownership.

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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.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
U.S. federal statutory tax rate	21.00%	34.00%	34.00%
Valuation allowance	$ 7,658,670	$ 6,453,466
Net change in total valuation allowance	$ 1,205,204
Cumulative change in ownership percentage	50.00%
Period for cumulative change in ownership	3 years
Unrecognized tax benefit that would impact effective tax rate, if recognized	$ 9,040
Income tax interest and penalties accrued	2,051	785
Income tax interest and penalties	1,266	$ 785	$ 0
Maximum
Income Taxes [Line Items]
U.S. federal statutory tax rate		35.00%
CALIFORNIA
Income Taxes [Line Items]
Net operating loss carry forwards	$ 5,759,329
Net operating loss carry forwards, expire period	2028
Federal
Income Taxes [Line Items]
Net operating loss carry forwards	$ 20,710,625
Net operating loss carry forwards, expire period	2020
Tax credit carry forwards	$ 1,360,917
Tax credit carry forwards, expire period	2026
Federal \| Maximum
Income Taxes [Line Items]
Operating loss carryforward available to offset future taxable income	$ 1,836,983
Percentage of future taxable income offset by operating loss carryforward	80.00%
State
Income Taxes [Line Items]
Tax credit carry forwards	$ 1,409,318