Stockholders' Equity - Reconciliation of Warrant Liability Measured at Fair Value (Detail) - USD ($) $ in Thousands |
2 Months Ended | 7 Months Ended | 9 Months Ended | |
|---|---|---|---|---|
Sep. 30, 2017 |
Jul. 31, 2017 |
Sep. 30, 2017 |
Sep. 30, 2016 |
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| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||||
| Change in common stock warrant fair value | $ 269 | $ (2) | ||
| Basis of Fair Value Measurements, Level 3 | ||||
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||||
| Beginning Balance | $ 49 | 49 | ||
| Change in common stock warrant fair value | $ (3) | 272 | ||
| Warrant liability related to Merger on August 1, 2017 | 1,120 | |||
| Ending Balance | $ 1,392 | $ 1,392 | ||
| Basis of Fair Value Measurements, Level 3 | 2014 Warrants | ||||
| Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||||
| Exercise of warrant put related to 2014 warrants | $ (46) | |||
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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 a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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