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Convertible Preferred Stock and Stockholders' Deficit - Summary of Outstanding Common Stock Warrants (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	105
Exercise Price $19.55
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	14
Exercise Price | $ / shares	$ 19.55
Expiration Date	2022-12
Exercise Price $9.73
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	30
Exercise Price | $ / shares	$ 9.73
Expiration Date	2021-02
Exercise Price $9.73
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	20
Exercise Price | $ / shares	$ 9.73
Expiration Date	2023-08
Exercise Price $9.73
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	20
Exercise Price | $ / shares	$ 9.73
Expiration Date	2024-03
Exercise Price $9.73
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	21
Exercise Price | $ / shares	$ 9.73
Expiration Date	2024-12

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+ References

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+ 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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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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