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Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 06, 2019	Mar. 31, 2019	May 31, 2019	Dec. 31, 2018	Jul. 16, 2018	May 31, 2018	Dec. 29, 2017
Subsequent Event [Line Items]
Exercise price (usd per share)					$ 2.10	$ 6.59	$ 7.42
Number of securities called by warrants (in shares)					11,520,000		316,163
Exercised (in shares)				4,050,000
Warrant Exercise Agreement | Subsequent Event
Subsequent Event [Line Items]
Warrants exercisable (in shares)	3,800,000
Exercise price (usd per share)	$ 1.10
Proceeds from issuance of warrants	$ 1.3
Exercised (in shares)	1,200,000
Class of warrant or right, new warrants issued (in shares)	1,200,000
Common Stock | Warrant Exercise Agreement | Subsequent Event
Subsequent Event [Line Items]
Exercise price (usd per share)	$ 1.40
Number of securities called by warrants (in shares)	3,800,000
Forecast
Subsequent Event [Line Items]
Proceeds from issuance of warrants		$ 4.2
Forecast | Warrant Exercise Agreement | Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of warrants			$ 4.2

X

- Definition

Class Of Warrant Or Right Exercised

+ References

No definition available.

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- Definition

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+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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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.

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