Share-based compensation arrangement by share-based payment award, closing price per share.

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, percentage of shares purchased for award.

+ References

No definition available.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award, program expiration date.

+ References

No definition available.

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- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ 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 (h)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ 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=109197908&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Dec. 20, 2017	Feb. 28, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted			2,343,000
Exchange of outstanding stock options, exercise price			$ 4.48		$ 5.62
Common stock exercise price			$ 2.02
Prior period reclassification adjustment related to stock-based compensation, additional paid in capital and net loss				$ 1.2
Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of options	8 years
Incremental fair value options	$ 0.6
Performance-based Awards [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted		250,000
Options to Purchase Common Stock [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exchange program, expiration date	Jan. 19, 2018
Exchange of outstanding stock options under option exchange program, closing price per share	$ 5.675
Options to Purchase Common Stock [Member] \| Common Stock [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased	1,992,000
Percentage of number of common stock purchased	81.51%
Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation vesting period			4 years
Contractual term of options			10 years
Equity Incentive Plan 2014 [Member] \| Options to Purchase Common Stock [Member] \| Common Stock [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted	1,570,328
Common stock exercise price	$ 5.675
Minimum [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation vesting period	1 year
Minimum [Member] \| Options to Purchase Common Stock [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exchange of outstanding stock options, exercise price	$ 12.00
Minimum [Member] \| Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percentage of fair market value			100.00%
Maximum [Member] \| Option Exchange [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation vesting period	3 years