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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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