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Stockholders’ Deficit - Cost Not Yet Recognized (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cost not yet recognized
Compensation cost not yet recognized	$ 19.5
Options to purchase common stock
Cost not yet recognized
Weighted-average remaining recognition period	3 years 2 months 12 days

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Amount of cost to be recognized for option under share-based payment arrangement.

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