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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Thousands, $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) Segment $ / shares | Sep. 30, 2021 EUR (€) | Jan. 28, 2021 $ / shares | Dec. 31, 2020 $ / shares | Oct. 27, 2020 $ / shares | Jun. 10, 2020 $ / shares
Accounting Policies [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ / shares | $ 0.01 |  | $ 0.01 | $ 0.01 |  | $ 0.01
Number of business segments | Segment | 1 |  |  |  |  |
October Offering |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ / shares | $ 0.01 |  |  |  | $ 0.01 |
June 3 SPA |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ / shares | 0.01 |  |  |  |  |
June 30 SPA |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ / shares | $ 0.01 |  |  |  |  |
Certificates Of Deposit |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | $ 30 |  |  |  |  |
Warrants Issued | October Offering |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | 11 |  |  |  |  |
Warrants Issued | June 3 SPA |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | 17 |  |  |  |  |
Warrants Issued | June 30 SPA |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash | 6 |  |  |  |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Cash, FDIC insured amount | 250 |  |  |  |  |
Cash, DGS insured amount | $ 116 | € 100 |  |  |  |

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