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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
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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

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- Definition Warrants and Rights Outstanding, Price Per Share + References No definition available. + Details
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- 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=117815213&loc=d3e19207-110258 + Details
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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 + Details
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- Details
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- Details
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