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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 |  |  |  |  |

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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 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 + Details
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