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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities |  |
Redeemable convertible preferred stock warrants | $ 1,103 | $ 422
Level 1 |  |
Liabilities |  |
Redeemable convertible preferred stock warrants | 0 | 0
Level 2 |  |
Liabilities |  |
Redeemable convertible preferred stock warrants | 0 | 0
Level 3 |  |
Liabilities |  |
Redeemable convertible preferred stock warrants | 1,103 | 422
Money market funds |  |
Assets |  |
Money market funds | 13,668 | 22,115
Money market funds | Level 1 |  |
Assets |  |
Money market funds | 13,668 | 22,115
Money market funds | Level 2 |  |
Assets |  |
Money market funds | 0 | 0
Money market funds | Level 3 |  |
Assets |  |
Money market funds | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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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 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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