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Fair Value of Financial Assets and Liabilities - Schedule of Aggregate Fair Values of Warrant Liability, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 8 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |
Balance as of the beginning of the period |  | $ 520
Initial fair value of warrant liability | 479 |
Change in fair value | 41 | 2,583
Warrant liability reclassified to additional paid-in-capital |  | (3,103)
Balance as of the end of the period | $ 520 |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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