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Convertible Preferred Stock - Shares Issued (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018
Class of Stock [Line Items]
Shares issued (in shares)	0	0
Share price (in dollars per share)				$ 1.49
Series B Preferred Stock
Class of Stock [Line Items]
Value of shares issued			$ 15.0
Shares issued (in shares)			8,691,179
Share price (in dollars per share)			$ 1.73		$ 1.73