CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	170,000,000
Common stock, shares issued	37,509,815	2,902,109
Common stock, shares outstanding	37,358,526	2,637,011
Series A Convertible Preferred Stock
Convertible preferred stock, par value		$ 0.0001
Convertible preferred stock, shares authorized		62,304,354
Convertible preferred stock, shares issued		62,269,144
Convertible preferred stock, shares outstanding		62,269,144
Convertible preferred stock, liquidation preference		$ 44,211
Series B Convertible Preferred Stock
Convertible preferred stock, par value		$ 0.0001
Convertible preferred stock, shares authorized		64,930,561
Convertible preferred stock, shares issued		64,930,561
Convertible preferred stock, shares outstanding		64,930,561
Convertible preferred stock, liquidation preference		$ 93,500