Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts	$ 221	$ 90
Common Class A
Common stock, par value (in dollars per share)	$ 0.000004	$ 0.000004
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares, issued (in shares)	26,769,797	14,931,016
Common stock, shares, outstanding (in shares)	26,769,797	14,931,016
Common Class B
Common stock, par value (in dollars per share)	$ 0.000004	$ 0.000004
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares, issued (in shares)	13,650,774	24,296,346
Common stock, shares, outstanding (in shares)	13,650,774	24,296,346