Equity Financings (Details) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended
Jun. 04, 2018	Mar. 23, 2018	Sep. 30, 2018
Equity [Abstract]
Proceeds from sale of stock	$ 41.9	$ 9.0	$ 50.9
Sale of stock, shares issued (in shares)	25,555,556	7,968,128
Stock price per share (in usd per share)	$ 1.80	$ 1.13
Number of warrants sold		7,968,128	8,765,496
Warrant price per unit (in usd per unit)		$ 0.125
Exercise price per warrant (in usd per share)		$ 1.20
Expiration period		5 years
Proceeds from warrant exercises			$ 7.3

Class Of Warrant Or Right, Expiration Period

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- Definition

Class Of Warrant Or Right, Price Per Share

+ References

No definition available.

+ Details

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Period Type:	instant

- 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

+ Details

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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
-Publisher FASB
-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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- References

No definition available.

+ Details

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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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Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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