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Preferred Stock (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 shares | Mar. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2017 series $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2016 $ / shares shares
Preferred Stock |  |  |  |  |
Preferred stock, authorized (in Shares) |  |  | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  | $ 0.001
Preferred Stock, shares issued (in shares) |  |  | 0 |  | 0
Share price (in dollars per share) | $ / shares |  |  | $ 0.001 |  |
Preferred stock, outstanding (in shares) |  |  | 0 |  | 0
Minimum number of series used to issue preferred stock | series |  |  | 1 |  |
Net proceeds from issuance of preferred stock | $ |  |  |  | $ 12,331 |
Initial public offering |  |  |  |  |
Preferred Stock |  |  |  |  |
Conversion of convertible preferred stock into common stock (in shares) | 9,029,549 |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |
Preferred Stock |  |  |  |  |
Preferred Stock, shares issued (in shares) |  | 13,062,965 |  |  |
Share price (in dollars per share) | $ / shares |  | $ 0.9503 |  |  |
Net proceeds from issuance of preferred stock | $ |  | $ 12,300 |  |  |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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