Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	38,000,000
Common stock, shares issued	39,082,017	6,890,250
Common stock, shares outstanding	39,082,017	6,890,250
Convertible Preferred Stock Series A, A-2, B, C, D and D-1 [Member]
Convertible preferred stock, par value	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	10,000,000	24,348,003
Convertible preferred stock, shares issued	0	22,866,987
Convertible preferred stock, shares outstanding	0	22,866,987
Convertible preferred stock, liquidation preference	$ 0	$ 137,283