Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	300,000,000	50,000,000
Common stock, shares issued	21,731,259	2,106,152
Common stock, shares outstanding	21,731,259	2,106,152
Convertible Preferred Stock, Series Seed
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	0	1,400,000
Preferred stock, shares issued	0	627,867
Preferred stock, shares outstanding	0	627,867
Preferred stock, aggregate liquidation preference	$ 0	$ 1,400
Convertible Preferred Stock, Series A
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	0	11,199,876
Preferred stock, shares issued	0	5,022,876
Preferred stock, shares outstanding	0	5,022,876
Preferred stock, aggregate liquidation preference	$ 0	$ 30,000
Convertible Preferred Stock, Series B
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	0	8,570,366
Preferred stock, shares issued	0	3,843,604
Preferred stock, shares outstanding	0	3,843,604
Preferred stock, aggregate liquidation preference	$ 0	$ 43,026
Convertible Preferred Stock, Series C
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	0	9,684,789
Preferred stock, shares issued	0	4,325,954
Preferred stock, shares outstanding	0	4,325,954
Preferred stock, aggregate liquidation preference	$ 0	$ 65,000