Fair Value Measurements - Additional Information (Details) - Convertible Preferred Stock Warrant Liability	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value liability valuation technique [Extensible List]	us-gaap:ValuationTechniqueOptionPricingModelMember	us-gaap:ValuationTechniqueOptionPricingModelMember
Fair Value Estimate
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value liability, measurement input	48.30	8.27
Measurement Input, Expected Term
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Expected term (in years)	1 year 9 months 18 days	2 years 3 months 21 days
Measurement Input, Risk Free Interest Rate
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value liability, measurement input	0.018	0.025
Measurement Input, Price Volatility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value liability, measurement input	0.611	0.553
Measurement Input, Expected Dividend Rate
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value liability, measurement input	0

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.

No definition available.

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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=117815213&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=117815213&loc=d3e19207-110258

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Indicates valuation technique for measuring 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)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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