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Shareholders' (Deficit) / Equity - Additional Information (Details) $ / shares in Units, € in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 6 Months Ended |  |  |  |  |  |  |
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Jul. 02, 2020 $ / shares shares | Jun. 05, 2020 $ / shares shares | Jun. 03, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) Vote $ / shares shares | Jun. 10, 2020 shares | Dec. 31, 2019 $ / shares shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2019 EUR (€) shares | Aug. 17, 2019 USD ($) shares | Aug. 17, 2019 EUR (€) shares | Jul. 15, 2019 USD ($) shares | Jul. 15, 2019 EUR (€) shares | Dec. 14, 2018 shares | Apr. 27, 2018 $ / shares shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  | 17,852,149 | 17,852,149 |  | 14,868,973 |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  |
Proceeds from registered direct offering, net of transaction costs | $ |  |  |  |  | $ 4,328 |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares authorized |  |  |  | 150,000,000 | 150,000,000 | 100,000,000 | 50,000,000 |  |  |  |  |  |  |  |
Number of vote per common share | Vote |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Common stock rights and preferences |  |  |  |  | The holders of ordinary shares have no preemptive or other subscription rights, and there are no redemption or sinking fund provisions with respect to such shares |  |  |  |  |  |  |  |  |  |
Undesignated preferred shares, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  |
Undesignated preferred shares, authorized |  |  |  | 100,000,000 | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  |  |  | 19,890 | 19,890 |  |  |  |  |  |  |  |  |  | 19,890
Silicon Valley Bank and Life Sciences Fund II LLC | Series B Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  |  |  | 19,890 | 19,890 |  |  |  |  |  |  |  |  |  | 19,890
Warrants to purchase ordinary shares, exercise price | $ / shares |  |  |  | $ 18.85 | $ 18.85 |  |  |  |  |  |  |  |  |  | $ 18.85
June 3 Offering | June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  | 2,971,770 |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per share | $ / shares |  |  | $ 1.6825 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares | $ |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offering, net of transaction costs | $ |  |  | $ 4,300 |  |  |  |  |  |  |  |  |  |  |  |
Warrants closing date |  |  | Jun. 05, 2020 |  |  |  |  |  |  |  |  |  |  |  |
June 30 Offering | June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares issued |  |  |  | 3,372,686 | 3,372,686 |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |
Purchase price per share | $ / shares |  |  |  | $ 1.4825 | 1.4825 |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds from ordinary shares | $ |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from registered direct offering, net of transaction costs | $ |  |  |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |
Warrants closing date |  |  |  | Jul. 02, 2020 |  |  |  |  |  |  |  |  |  |  |
Private Placement | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  | 208,023 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  | $ 2.1031 | $ 1.62 |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  | Jun. 03, 2025 | Dec. 05, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Securities Purchase Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  |  | 1,485,885 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | June 30 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares | 236,088 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares | $ 1.8531 |  |  | $ 1.42 | $ 1.42 |  |  |  |  |  |  |  |  |  |
Warrants expiry date | Jun. 30, 2025 |  |  | Jan. 02, 2026 |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | June 30 SPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  |  |  | 1,686,343 | 1,686,343 |  |  |  |  |  |  |  |  |  |
Private Placement | June 3 SPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants closing date |  |  | Jun. 05, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  | 208,023 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase ordinary shares, exercise price | $ / shares |  | $ 2.1031 | $ 1.62 |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiry date |  | Jun. 03, 2025 | Dec. 05, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares issued to purchase warrants |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | June 3 SPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase ordinary shares |  |  | 1,485,885 |  |  |  |  |  |  |  |  |  |  |  |
Supplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, maximum shares authorized for subscription |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |
Maximum subscription units to be accepted |  |  |  |  |  |  |  | 199,056 | 199,056 | 245,493 | 245,493 | 17,222 | 17,222 |  |
Issuance of ordinary shares under subscription agreement | $ |  |  |  |  |  |  |  | $ 1,260 |  | $ 1,670 |  | $ 110 |  |  |
Payment receivable upon common stock subscription agreement |  |  |  |  |  |  |  | $ 1,260 | € 1,150 | $ 1,670 | € 1,500 | $ 110 | € 100 |  |

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