CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENT OF FINANCIAL POSITION
Convertible preferred stock, par value		$ 0.001
Convertible preferred stock, shares authorized	0	43,157,651
Convertible preferred stock, shares issued	0	43,135,911
Convertible preferred stock, shares outstanding	0	43,135,911
Aggregate liquidation preference		$ 109,561
Preferred stock, par value	$ 0.001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	60,000,000
Common stock, shares issued	25,241,766	3,970,586
Common stock, shares outstanding	25,241,766	3,970,586