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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Segment $ / shares | Jun. 30, 2020 EUR (€) | Dec. 31, 2019 $ / shares
Accounting Policies [Line Items] |  |  |
Ordinary shares, par value | $ / shares | $ 0.01 |  | $ 0.01
Number of business segments | Segment | 1 |  |
June 3 Offering |  |  |
Accounting Policies [Line Items] |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares | $ 0.01 |  |
Certificates Of Deposit |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | $ 90 |  |
Warrants Issued | June 3 SPA |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | 17 |  |
Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Cash, FDIC insured amount | 250 |  |
Cash, DGS insured amount | $ 112 | € 100 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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