Organization and Description of Business - Reverse Stock Split (Details)	1 Months Ended
	Oct. 31, 2017 shares
Series A Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.75
Series B Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.75
Series C Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.75
Series D Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.75
Series E Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.75
Series F Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion	0.5
Common Stock
Class of Stock [Line Items]
Stock split conversion ratio	0.5