Shareholders' Equity - Summary of Restricted Stock Unit Activity (Detail)	9 Months Ended
Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of Shares, Ending Balance	172,887
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Number of Shares, Beginning Balance	186,516
Granted, Number of Shares	225,693
Vested, Number of Shares	(204,679)
Forfeited, Number of Shares	(34,643)
Unvested, Number of Shares, Ending Balance	172,887
Expected to vest, Number of Shares, Ending Balance	159,795
Unvested, Weighted Average Award Price, Beginning Balance \| $ / shares	$ 2.88
Granted, Weighted Average Award Price \| $ / shares	1.44
Vested, Weighted Average Award Price \| $ / shares	2.19
Forfeited, Weighted Average Award Price \| $ / shares	4.68
Unvested, Weighted Average Award Price, Ending Balance \| $ / shares	1.46
Expected to vest, Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 1.46

Restricted stock units shares expected to vest.

No definition available.

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- Definition

Weighted average grant date fair value of restricted stock units expected to vest.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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