Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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.

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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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No definition available.

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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

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-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

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

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- Definition

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

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- Definition

Percentage of vesting of share-based compensation awards.

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Share-Based Compensation - Stock Option Activity - Textual (Details) - $ / shares					3 Months Ended
	Mar. 07, 2019	Feb. 01, 2019	Jan. 02, 2019	Jan. 02, 2018	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)					989,000
Weighted average exercise price, granted (USD per share)					$ 1.89
Executives and Key Personnel
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price, granted (USD per share)			$ 1.87
Award requisite service period			1 year
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			300,000
Weighted average exercise price, granted (USD per share)			$ 1.87
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			24,000
Weighted average exercise price, granted (USD per share)			$ 1.87
Contractor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price, granted (USD per share)	$ 3.00	$ 1.87
Award requisite service period	1 year	1 year
Stock Option \| Executives and Key Personnel
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			600,000
Award vesting period			4 years
Stock Option \| Board of Directors \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options that will vest			25.00%
Stock Option \| Board of Directors \| Share-based Compensation Award, Tranche Two through Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options that will vest			75.00%
Award vesting period			4 years
Stock Option \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Stock Option \| Contractor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	15,000	50,000