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Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of Warrants | shares	2,669,855
Weighted Average Exercise Price | $ / shares	$ 7.07
2019
Class Of Warrant Or Right [Line Items]
Year of Expiration	2019
Number of Warrants | shares	224,323
Weighted Average Exercise Price | $ / shares	$ 15.73
2020
Class Of Warrant Or Right [Line Items]
Year of Expiration	2020
Number of Warrants | shares	44,299
Weighted Average Exercise Price | $ / shares	$ 15.96
2022
Class Of Warrant Or Right [Line Items]
Year of Expiration	2022
Number of Warrants | shares	2,401,233
Weighted Average Exercise Price | $ / shares	$ 6.10

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- Definition

Year during which outstanding warrants of company stock will expire.

+ References

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- Definition

Weighted average exercise price of warrants or rights.

+ References

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- Definition

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+ References

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+ 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

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