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Warrants - Issued and Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Mar. 01, 2017	Dec. 22, 2016	Nov. 09, 2015	Oct. 20, 2015	Nov. 26, 2014	Jul. 19, 2013	Jul. 01, 2012
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	280,876	280,876
Common Stock
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	124,326	124,326
Common Stock | Warrants Issued 7/19/2013
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	101,010	101,010						101,010
Price per Share (in dollars per share)	$ 3.96	$ 3.96						$ 3.96
Fair Value at the Date of Issuance								$ 244
Common Stock | Warrants Issued 11/26/2014
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	21,928	21,928					21,928
Price per Share (in dollars per share)	$ 3.42	$ 3.42					$ 3.42
Fair Value at the Date of Issuance							$ 47
Common Stock | Warrants Issued 3/1/2017
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	1,388	1,388	1,388
Price per Share (in dollars per share)	$ 5.94	$ 5.94	$ 5.94
Fair Value at the Date of Issuance			$ 5
Common Stock | Common Stock Warrants
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	124,326	124,326
Redeemable Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	156,550	156,550
Redeemable Convertible Preferred Stock | Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	156,550	156,550
Warrants exercise period from date of issuance	10 years
Series 5 Preferred Stock | Warrants Issued 7/1/2012
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	54,917	54,917							54,917
Price per Share (in dollars per share)	$ 9.1	$ 9.1							$ 9.10
Fair Value at the Date of Issuance									$ 255
Series 5 Preferred Stock | Warrants Issued 7/19/2013
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	21,989	21,989						21,989
Price per Share (in dollars per share)	$ 9.1	$ 9.1						$ 9.10
Fair Value at the Date of Issuance								$ 122
Series 6 Preferred Stock | Warrants Issued 11/26/2014
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	6,310	6,310					6,310
Price per Share (in dollars per share)	$ 16.47	$ 16.47					$ 16.47
Fair Value at the Date of Issuance							$ 49
Series 6 Preferred Stock | Warrants Issued 10/20/2015
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	39,339	39,339				39,339
Price per Share (in dollars per share)	$ 16.47	$ 16.47				$ 16.47
Fair Value at the Date of Issuance						$ 396
Series 6 Preferred Stock | Warrants Issued 11/9/2015
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	24,283	24,283			24,283
Price per Share (in dollars per share)	$ 16.47	$ 16.47			$ 16.47
Fair Value at the Date of Issuance					$ 244
Series 7 Preferred Stock | Warrants Issued 12/22/2016
Class of Warrant or Right [Line Items]
Number of Shares Underlying Warrants (in shares)	9,712	9,712		9,712
Price per Share (in dollars per share)	$ 10.03	$ 10.03		$ 10.03
Fair Value at the Date of Issuance				$ 45

X

- 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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ 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
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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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