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Nature of the Business - (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 13, 2019 USD ($) $ / shares shares | May 03, 2019 | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares
Nature of the Business |  |  |  |  |  |
Reverse stock split ratio |  | 0.1245 |  |  |  |
Proceeds from issuance of shares, net | $ |  |  | $ 77,264 |  |  |
Common stock, shares outstanding | 15,560,569 |  | 22,739,345 |  | 1,374,812 | 1,369,212
Preferred stock, shares outstanding | 0 |  | 0 |  | 0 |
Common stock, number of shares authorized | 100,000,000 |  | 100,000,000 |  | 158,745,671 | 84,045,455
Common stock, par value per share | $ / shares | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001
Preferred stock, number of shares authorized | 10,000,000 |  | 10,000,000 |  | 0 |
Preferred stock, par value per share | $ / shares | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
IPO |  |  |  |  |  |
Nature of the Business |  |  |  |  |  |
Issuance of stock (in shares) | 5,750,000 |  |  |  |  |
Share price | $ / shares | $ 15.00 |  |  |  |  |
Proceeds from issuance of shares, net | $ | $ 77,000 |  |  |  |  |
Underwriting discounts and commissions | $ | 6,000 |  |  |  |  |
Offering expenses | $ | $ 3,400 |  |  |  |  |

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