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Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 26, 2018 USD ($) $ / shares shares | May 30, 2018 USD ($) $ / shares shares | May 15, 2018 $ / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Reverse share split |  |  | 0.0636 |  |  |  |  |
Share consolidation basis nominal value per share | $ / shares |  |  | $ 0.01571 |  |  |  |  |
Share consolidation basis renominalisation value per share | $ / shares |  |  | $ 0.01 |  |  |  |  |
Net proceeds from issuance of stock after deducting underwriting discounts,commissions and offering cost | $ 2,400 | $ 71,800 |  |  |  | $ 74,155 |  |
Net losses |  |  |  | $ 15,747 | $ 6,280 | 27,893 | $ 12,117 | $ 29,406
Accumulated deficit |  |  |  | 82,630 |  | 82,630 |  | 54,737
Cash and cash equivalents |  |  |  | 84,901 |  | 84,901 |  | 8,485
Short-term investments |  |  |  | 50,370 |  | 50,370 |  | $ 30,731
Cash resources available under the secured credit facility |  |  |  | $ 15,000 |  | $ 15,000 |  |
IPO |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Number of shares issued | shares | 200,000 | 6,150,000 |  |  |  |  |  |
Offering price per share | $ / shares | $ 13.00 | $ 13.00 |  |  |  |  |  |

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