Warrants - Summary of Change in Warrant (Detail) - Warrants Not Settleable in Cash [Member] - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding, Beginning balance	4,329,437
Number of Warrants, Outstanding, Ending balance	4,329,437	4,329,437
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 1.03
Weighted Average Exercise Price, Outstanding, Ending balance	$ 1.03	$ 1.03
Weighted Average Remaining Contractual Life, Outstanding	3 years 6 months	3 years 8 months 12 days
Weighted Average Fair Value, Outstanding, Beginning balance	$ 0.26
Weighted Average Fair Value, Outstanding, Ending balance	$ 0.26	$ 0.26

Weighted average per share amount of non-option equity instruments outstanding as of reporting date.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

+ Details

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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