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Investment Unit - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
	Mar. 12, 2014	Dec. 31, 2013	Mar. 31, 2019	Dec. 31, 2018
Investment Unit Details [Line Items]
Debt instrument, face amount			$ 4,500,000
Debt instrument, interest rate, stated percentage			8.00%
Debt instrument, maturity date			Aug. 13, 2020
Debt instrument, description			If no event of default occurs prior to August 13, 2020, the Promissory Note and all related interest will be cancelled.
Warrant, right to purchase, percentage			80.00%
Warrant, discount rate			20.00%
Class of warrant or right, exercise price of warrants or rights	$ 0.001		$ 0.001
Conversion of warrants to common stock	1,235,219
Fair value adjustment of warrants		$ 2,500,000	$ 0
Value of investment unit			$ 0	$ 0
Series B Preferred Stock
Investment Unit Details [Line Items]
Stock issued during period, shares, new issues	184,797

X

- Definition

Conversion of stock shares issued and forward stock split.

+ References

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- Definition

Value of investment unit.

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- Definition

Investment unit.

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- Definition

Discount rate of warrant

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- Definition

Percentage of total value of the right to purchase a warrant.

+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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X

- Definition

Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

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- Definition

Number of new stock issued during the period.

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