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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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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.

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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

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