Class of Warrant or Right, Exercise Period

No definition available.

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- Definition

Class of Warrant or Right, Period of Time After Issuance to Become Exercisable

+ References

No definition available.

+ Details

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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

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.

+ Details

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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- Definition

Number 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Period Type:	instant

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended					12 Months Ended
	May 31, 2018	May 29, 2018	Dec. 11, 2017	Dec. 08, 2017	Jul. 31, 2018	May 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Jan. 06, 2018	Dec. 07, 2017
Class of Warrant or Right [Line Items]
Number of warrants (shares)							5,452,923			7,392,966	5,452,923
Warrants exercise price (usd per share)							$ 11.32			$ 7.36	$ 11.32
Warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)							1,385,556			1,205,840	1,385,556
Level 3 \| Warrants
Class of Warrant or Right [Line Items]
Non-cash expense (income) resulting from change in estimated fair value										$ 0.9	$ 4.9
Issued in 2017 Common Stock Offering - pre-funded warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)							1,184,422				1,184,422		1,184,422
Issued in 2017 Common Stock Offering - common warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)				82,118			82,118				82,118	409,091	2,809,404
Issued in 2017 Series A Preferred Stock Offering
Class of Warrant or Right [Line Items]
Number of warrants (shares)								687,468
Warrants exercise price (usd per share)								$ 12.69
Warrant exercise period								5 years
Period of time after issuance for warrants to become exercisable								6 months
Issued with September 2016 Convertible Notes
Class of Warrant or Right [Line Items]
Number of warrants (shares)							1,205,840		1,205,840	1,205,840	1,205,840
Warrants exercise price (usd per share)									$ 22.50	$ 22.50
Warrant exercise period									5 years
Period of time after issuance for warrants to become exercisable									6 months
Warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)							4,067,367			6,187,126	4,067,367
Warrants \| Issued in July 2018 Private Placement - common warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)					958,152		0			958,152	0
Warrants exercise price (usd per share)					$ 2.70					$ 2.70
Warrant exercise period					5 years 6 months
Warrants \| Issued in July 2018 Registered Direct Offering - underwriter warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)					103,186		0			103,186	0
Warrants exercise price (usd per share)					$ 3.464					$ 3.464
Warrants \| Warrants Issued in 2018 Private Placement - Common Warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)	1,528,668					1,528,668
Warrants exercise price (usd per share)	$ 2.86					$ 2.86
Warrant exercise period		5 years 6 months				5 years 6 months
Warrants \| Issued in May 2018 Registered Direct Offering - underwriter warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)	142,676					142,676	0			142,676	0
Warrants exercise price (usd per share)	$ 3.679					$ 3.679				$ 3.679
Warrant exercise period	5 years
Warrants \| Issued in 2017 Common Stock Offering - pre-funded warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)							483,221			0	483,221
Warrants exercise price (usd per share)			$ 0.05							$ 0.05
Warrants \| Issued in 2017 Common Stock Offering - common warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)							2,809,404			2,679,702	2,809,404
Warrants exercise price (usd per share)			$ 3.85				$ 3.85			$ 3.85	$ 3.85	$ 3.85	$ 3.85
Warrant exercise period			5 years				5 years
Warrants \| Issued in 2017 Common Stock Offering - underwriter warrants
Class of Warrant or Right [Line Items]
Number of warrants (shares)				87,274			87,274			87,274	87,274
Warrants exercise price (usd per share)			$ 4.8125	$ 4.8125			$ 4.8125			$ 4.8125	$ 4.8125
Warrant exercise period			5 years	5 years			5 years
Warrants \| Issued in 2017 Series A Preferred Stock Offering
Class of Warrant or Right [Line Items]
Number of warrants (shares)							687,468			687,468	687,468
Warrants exercise price (usd per share)										$ 12.69
Common Stock \| Issued in 2017 Common Stock Offering - common warrants
Class of Warrant or Right [Line Items]
Number of shares per warrant (shares)													1
Common Stock \| Warrants \| Issued in 2017 Common Stock Offering - common warrants
Class of Warrant or Right [Line Items]
Number of shares per warrant (shares)							1				1