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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