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Stockholders’ Deficit - Stock Incentive Plan (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 plan shares | Dec. 31, 2018 plan shares
Stock-based compensation |  |
Number of stock-based compensation plans | plan | 2 | 2
Incentive stock options and non-statutory stock options, exercise price to fair value of common stock, maximum (as a percent) | 100.00% | 100.00%
Shareholder stock options, exercise price to fair value of common stock, maximum (as a percent) | 110.00% | 110.00%
Unvested shares subject to repurchase (in shares) | shares | 0 | 0
Options to purchase common stock |  |
Stock-based compensation |  |
Vesting period | 4 years | 4 years
Term of award | 10 years | 10 years

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