Fair Value Measurements - Summary of Rollforward of Fair Value of Convertible Notes (Details) - Convertible Notes - USD ($) $ in Thousands |
1 Months Ended | 9 Months Ended |
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May 31, 2018 |
Sep. 30, 2018 |
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Fair value upon the May 2018 closing | $ 12,535 | |
| Change in fair value at September 30, 2018 | $ 6,244 | |
| Significant Unobservable Inputs (Level 3) | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Fair value upon the May 2018 closing | 12,535 | |
| Change in fair value at September 30, 2018 | 6,244 | |
| Fair value at September 30, 2018 | $ 18,779 |
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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. No definition available.
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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