Subsequent Event (Details) - $ / shares		6 Months Ended
Aug. 07, 2018	Jun. 30, 2018
Subsequent Event [Line Items]
Stock options granted (in shares)		1,643,400
Subsequent Event \| Chief Executive Officer \| Stock options
Subsequent Event [Line Items]
Stock options granted (in shares)	1,350,000
Exercise price (in usd per share)	$ 1.60
Stock option term	10 years
Award anniversary period	1 year
Subsequent Event \| Chief Executive Officer \| Stock options \| First anniversary of grant date
Subsequent Event [Line Items]
Award vesting period	4 years
Award vesting, percentage	25.00%
Subsequent Event \| Chief Executive Officer \| Stock options \| Successive three-month period after anniversary date
Subsequent Event [Line Items]
Award vesting period	3 months
Award vesting, percentage	6.25%

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.

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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

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- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

+ Details

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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

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Expected term of share-based compensation awards, 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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