Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts and returns	$ 2,311	$ 818
Common Class A [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	46,318,317	46,181,320
Common stock, shares outstanding	46,318,317	46,181,320
Common Class B [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	31,099,011	31,099,011
Common stock, shares outstanding	31,099,011	31,099,011