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Convertible Preferred Stock Warrants - Fair Value Measurement Inputs and Valuation Techniques (Details) - Warrants to purchase convertible preferred stock	Sep. 30, 2019 M $ / shares	Dec. 31, 2018 Y $ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, price (in dollars per share)	$ 8.42	$ 2.27
Warrants, valuation technique	us-gaap:ValuationTechniqueOptionPricingModelMember	us-gaap:ValuationTechniqueOptionPricingModelMember
Measurement Input, Expected Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	6	2
Measurement Input, Option Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	0.45	0.43
Measurement Input, Risk Free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	1.8	2.3

X

- Definition

Warrants and Rights Outstanding, Price Per Share

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

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X

- 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

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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- Details

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