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Convertible Preferred Stock Warrants - Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class of Warrant or Right [Line Items] |  |  |  |
Total liability, beginning of period |  |  | $ 4,589 |
Revaluation of remaining warrants | $ 11,226 | $ 918 | 12,419 | $ 1,561
Total liability, end of period | $ 17,008 |  | $ 17,008 |
Warrants to purchase convertible preferred stock |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Total warrants, beginning of period (in shares) |  |  | 2,019,245 |
Revaluation of remaining warrants (in shares) |  |  | 0 |
Total warrants, end of period (in shares) | 2,019,245 |  | 2,019,245 |
Total liability, beginning of period |  |  | $ 4,589 |
Revaluation of remaining warrants |  |  | 12,419 |
Total liability, end of period | $ 17,008 |  | $ 17,008 |

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- Definition Fair Value Adjustment of Warrants, Shares + 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 Number of warrants or rights outstanding. + 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 + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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- Definition 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 + Details
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- Details
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