Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts receivable, net of allowance for doubtful accounts	$ 163	$ 90
Common Class A
Common stock, par value	$ 0.000004	$ 0.000004
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares, issued	16,472,377	14,931,016
Common stock, shares, outstanding	16,472,377	14,931,016
Common Class B
Common stock, par value	$ 0.000004	$ 0.000004
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares, issued	23,217,356	2,429,634
Common stock, shares, outstanding	23,217,356	2,429,634