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.

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ 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
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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Period Type:

Stock-based Compensation - 2015 Inducement Plan (Detail) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Apr. 30, 2021	Jun. 09, 2019	Jun. 08, 2019	Mar. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option to purchase (shares)	874,050
2015 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized under the plan (in shares)			500,000	90,000	45,000	45,000
Option to purchase (shares)	187,800	17,500
Possible future issuance under equity compensation plan (in shares)	235,000	14,050