Warrants (Details) - $ / shares	1 Months Ended	12 Months Ended
	Oct. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Oct. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Number of securities called by warrants							495,775
Exercise price of warrants (in dollars per share)							$ 0.14
Stock issued from exercise of warrants (in shares)	6,548
Warrants, outstanding			313,741	0
Series A Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Number of securities called by warrants						5,386
Exercise price of warrants (in dollars per share)						$ 0.93
Series B Convertible Preferred Stock
Class of Warrant or Right [Line Items]
Number of securities called by warrants					4,965
Exercise price of warrants (in dollars per share)					$ 3.16
Common Stock
Class of Warrant or Right [Line Items]
Stock issued from exercise of warrants (in shares)		320,289	89,030
Shares issued during period, exercise of warrants prior to IPO		313,741	89,030