Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2020	Dec. 31, 2019
Common stock, shares outstanding	24,658	23,554
Class A common stock
Common stock, par value	$ 0.001	$ 0.001
Common stock authorized	125,000	125,000
Common Stock, Shares, Issued	24,658	23,554
Common stock, shares outstanding	24,658	23,554
Class B common stock
Common stock, par value	$ 0.001	$ 0.001
Common stock authorized	100,000	100,000
Common Stock, Shares, Issued	3,770	4,752
Common stock, shares outstanding	3,770	4,752