Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common stock, shares outstanding	16,132,043	13,222,583
Class A common stock
Common stock, par value	$ 0.001	$ 0.001
Common stock authorized	125,000,000	125,000,000
Common Stock, Shares, Issued	16,132,043	13,222,583
Common stock, shares outstanding	16,132,043	13,222,583
Class B common stock
Common stock, par value	$ 0.001	$ 0.001
Common stock authorized	8,401,521	8,401,521
Common Stock, Shares, Issued	8,401,521	8,268,188
Common stock, shares outstanding	8,401,521	8,268,188