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Preferred and Common Stock Warrants - Assumptions Used to Calculate Fair Value of Outstanding Warrants (Details) - Redeemable Convertible Preferred Stock Warrants	Dec. 31, 2017	Dec. 31, 2016
Dividend Yield
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input	0	0
Expected Term
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input	2 years 9 months
Expected Term | Minimum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		6 months
Expected Term | Maximum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		3 years 9 months
Risk-Free Interest Rates
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input	0.018
Risk-Free Interest Rates | Minimum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		0.010
Risk-Free Interest Rates | Maximum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		0.016
Expected Volatility
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input	0.346
Expected Volatility | Minimum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		0.348
Expected Volatility | Maximum
Class of Warrant or Right [Line Items]
Outstanding warrants measurement input		0.392

X

- 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

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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