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The Company and Nature of Business (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 16, 2018 USD ($) $ / shares shares | Oct. 31, 2018 | Sep. 30, 2018 shares | Dec. 31, 2017 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Warrants to purchase shares of stock (in shares) |  |  | 280,876 | 280,876
Redeemable Convertible Preferred Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Warrants to purchase shares of stock (in shares) |  |  | 156,550 | 156,550
Common Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Warrants to purchase shares of stock (in shares) |  |  | 124,326 | 124,326
Preferred Stock Warrants | Redeemable Convertible Preferred Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Warrants to purchase shares of stock (in shares) |  |  | 156,550 | 156,550
Subsequent Event |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Reverse stock split ratio |  | 0.0556 |  |
Common stock issued upon conversion of redeemable convertible preferred stock (in shares) | 12,066,654 |  |  |
Adjustments to additional paid-in capital related to warrants | $ | $ 1.1 |  |  |
Subsequent Event | IPO |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued in IPO (in shares) | 8,280,000 |  |  |
IPO share price (in dollars per share) | $ / shares | $ 15.00 |  |  |
Net proceeds from IPO | $ | $ 113.7 |  |  |
Subsequent Event | Common Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Warrants to purchase shares of stock (in shares) | 284,983 |  |  |
Subsequent Event | Preferred Stock Warrants | Redeemable Convertible Preferred Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of warrants converted (in shares) | 156,550 |  |  |

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