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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based compensation expense |  |  |  |
Stock-based compensation expense | $ 895 | $ 722 | $ 2,397 | $ 2,064
Unrecognized stock-based compensation expense | 5,100 |  | $ 5,100 |
Unrecognized compensation expense, weighted-average period expected to be recognized |  |  | 2 years 6 months |
Research and development |  |  |  |
Share-based compensation expense |  |  |  |
Stock-based compensation expense | 176 | 132 | $ 484 | 378
General and administrative |  |  |  |
Share-based compensation expense |  |  |  |
Stock-based compensation expense | 627 | 504 | 1,692 | 1,403
Sales and marketing |  |  |  |
Share-based compensation expense |  |  |  |
Stock-based compensation expense | $ 92 | $ 86 | $ 221 | $ 283

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