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Stockholders' Equity - (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Common stock reserved |  |  |  |
Net proceeds |  |  |  | $ 24,524
At-the-Market Sales Agreement |  |  |  |
Common stock reserved |  |  |  |
Maximum amount of shares for offering | $ 25,000 |  |  |
Maximum commission percentage | 3.00% |  |  |
Net proceeds |  | $ 2,200 | $ 2,200 |
Number of shares sold |  |  | 377,115 |
Shares available for future issuance |  | $ 22,600 | $ 22,600 |

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