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Equity - Schedule of Common Stock Purchase Warrant Activity (Detail) - Warrant - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Warrants, Outstanding, Beginning balance	3,864,551	748,060
Number of Warrants, Issued	0	3,166,491
Number of Warrants, Cancelled or expired		(15,385)
Number of Warrants, Exercised		(34,615)
Number of Warrants, Outstanding, Ending balance	3,864,551	3,864,551
Weighted Avg. Exercise Price, Outstanding, Beginning balance	$ 4.60	$ 5.17
Weighted Avg. Exercise Price, Issued		4.47
Weighted Avg. Exercise Price, Outstanding, Ending balance	$ 4.60	$ 4.60

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- Definition

Share based compensation arrangement by share based payment award non option equity instruments outstanding weighted average exercise price.

+ References

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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.

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- Definition

Number of non-option equity instruments exercised by participants.

+ References

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

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Net number of non-option equity instruments granted to participants.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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